20th century

The 20th (twentieth) century began on January 1, 1901 (MCMI), and ended on December 31, 2000 (MM).[1] The 20th century was dominated by significant events that defined the modern era: Spanish flu pandemic, World War I and World War II, nuclear weapons, nuclear power and space exploration, nationalism and decolonization, technological advances, and the Cold War and post-Cold War conflicts. These reshaped the political and social structure of the globe.

Millennium: 2nd millennium
Centuries:
Timelines:
  • 19th century
  • 20th century
  • 21st century
State leaders:
  • 19th century
  • 20th century
  • 21st century
Decades:
  • 1900s
  • 1910s
  • 1920s
  • 1930s
  • 1940s
  • 1950s
  • 1960s
  • 1970s
  • 1980s
  • 1990s
Categories: Births – Deaths
Establishments – Disestablishments
The Blue Marble, Earth as seen from Apollo 17 in December 1972. The photograph was taken by LMP Harrison Schmitt. The second half of the 20th century saw humanity's first space exploration.

The 20th century saw a massive transformation of humanity's relationship with the natural world. Global population, sea level rise, and ecological collapses increased while competition for land and dwindling resources accelerated deforestation, water depletion, and the mass extinction of many of the world's species and decline in the population of others. Global heating increased the risk of extreme weather conditions.

Additional themes include intergovernmental organizations and cultural homogenization through developments in emerging transportation and communications technology; poverty reduction and rising standards of living, world population growth, awareness of environmental degradation, ecological extinction;[2][3] and the birth of the Digital Revolution. Automobiles, airplanes and the use of home appliances became common, as did video and audio recording. Great advances in power generation, communication, and medical technology allowed for near-instantaneous worldwide computer communication and genetic modification of life.

The repercussions of the World Wars, Cold War, and globalization crafted a world where people are more united than any previous time in human history, as exemplified by the establishment of international law, international aid, and the United Nations. The Marshall Plan—which spent $13 billion ($110 billion in 2020 U.S. dollars)[4] to rebuild the economies of post-war nations—launched "Pax Americana". Throughout the latter half of the 20th century, the rivalry between the United States and the Soviet Union created enormous tensions around the world which manifested in various armed proxy regional conflicts and the omnipresent danger of nuclear proliferation. The dissolution of the Soviet Union in 1991 after the collapse of its European alliance was heralded by the West as the end of communism, though by the century's end roughly one in six people on Earth lived under communist rule, mostly in China which was rapidly rising as an economic and geopolitical power.

It took over two hundred thousand years of modern human history and 6 million years of human evolution for the world's population to reach 1 billion in 1804;[5] world population reached an estimated 2 billion in 1927; by late 2000, the global population reached 6 billion, with over half in East, South and Southeast Asia.[6][7][8] Global literacy averaged 80%. Penicillin and other medical breakthroughs combined with the World Health Organization's global vaccination campaigns to eradicate smallpox and other diseases responsible for more human deaths than all wars and natural disasters combined yielded unprecedented results; smallpox now only existed in labs.[9][10] Machines came to be used in all areas of production, feeding increasingly intricate supply chains that allowed mankind for the first time to be constrained not by how much it could produce, but by peoples' willingness to consume. Trade improvements greatly expanded upon the limited set of food-producing techniques used since the Neolithic period, multiplying the diversity of foods available and boosting the quality of human nutrition. Until the early 19th century, life expectancy from birth was about thirty in most populations; global lifespan-averages exceeded 40 years for the first time in history, with over half achieving 70 or more years (three decades longer than a century earlier).[11]

Overview

Map of the British Empire (as of 1910). At its height, it was the largest empire in history.

Chronological history

The 20th (twentieth) century began on January 1, 1901,[1] and ended on December 31, 2000.[12] It was the tenth and final century of the 2nd millennium. Unlike most century years, the year 2000 was a leap year, and the second century leap year in the Gregorian calendar after 1600.

The century had the first global-scale total wars between world powers across continents and oceans in World War I and World War II. Nationalism became a major political issue in the world in the 20th century, acknowledged in international law along with the right of nations to self-determination, official decolonization in the mid-century, and related regional conflicts.

The century saw a major shift in the way that many people lived, with changes in politics, ideology, economics, society, culture, science, technology, and medicine. The 20th century may have seen more technological and scientific progress than all the other centuries combined since the dawn of civilization. Terms like nationalism, globalism, environmentalism, ideology, world war, genocide, and nuclear war entered common usage. Scientific discoveries, such as the theory of relativity and quantum physics, profoundly changed the foundational models of physical science, forcing scientists to realize that the universe was more complex than previously believed, and dashing the hopes (or fears) at the end of the 19th century that the last few details of scientific knowledge were about to be filled in. It was a century that started with horses, simple automobiles, and freighters but ended with high-speed rail, cruise ships, global commercial air travel and the Space Shuttle. Horses and other pack animals, every society's basic form of personal transportation for thousands of years, were replaced by automobiles and buses within a few decades. These developments were made possible by the exploitation of fossil fuel resources, which offered energy in an easily portable form, but also caused concern about pollution and long-term impact on the environment. Humans explored space for the first time, taking their first footsteps on the Moon.

World powers and empires in 1914, just before the First World War.
(The Austro-Hungarian flag should be shown instead of the Austrian Empire's one)

Mass media, telecommunications, and information technology (especially computers, paperback books, public education, and the Internet) made the world's knowledge more widely available. Public health improvements led to global life expectancy increasing from 35 years to 65 years. Rapid technological advancements, however, also allowed warfare to reach unprecedented levels of destruction. World War II alone killed over 60 million people, while nuclear weapons gave humankind the means to annihilate itself in a short time. However, these same wars resulted in the destruction of the imperial system. For the first time in human history, empires and their wars of expansion and colonization ceased to be a factor in international affairs, resulting in a far more globalized and cooperative world. The last time major powers clashed openly was in 1945, and since then, violence has seen an unprecedented decline.[13]

The world also became more culturally homogenized than ever with developments in transportation and communications technology, popular music and other influences of Western culture, international corporations, and what was arguably a truly global economy by the end of the 20th century.

Summary

At the beginning of the period, the British Empire was the world's most powerful nation,[14] having acted as the world's policeman for the past century.

Technological advancements during World War I changed the way war was fought, as new inventions such as tanks, chemical weapons, and aircraft modified tactics and strategy. After more than four years of trench warfare in Western Europe, and up to 22 million dead, the powers that had formed the Triple Entente (France, Britain, and Russia, later replaced by the United States and joined by Italy and Romania) emerged victorious over the Central Powers (Germany, Austria-Hungary, the Ottoman Empire and Bulgaria). In addition to annexing many of the colonial possessions of the vanquished states, the Triple Entente exacted punitive restitution payments from them, plunging Germany in particular into economic depression. The Austro-Hungarian and Ottoman empires were dismantled at the war's conclusion. The Russian Revolution resulted in the overthrow of the Tsarist regime of Nicholas II and the onset of the Russian Civil War. The victorious Bolsheviks then established the Soviet Union, the world's first communist state.

Anachronous world map showing member states of the League of Nations, the first global international body of governance created to prevent war after World War I, during its 26-year interwar period history.

Fascism, a movement which grew out of post-war angst and which accelerated during the Great Depression of the 1930s, gained momentum in Italy, Germany, and Spain in the 1920s and 1930s, culminating in World War II, sparked by Nazi Germany's aggressive expansion at the expense of its neighbors. Meanwhile, Japan had rapidly transformed itself into a technologically advanced industrial power and, along with Germany and Italy, formed the Axis powers. Japan's military expansionism in East Asia and the Pacific Ocean brought it into conflict with the United States, culminating in a surprise attack which drew the US into World War II.

Ukraine, early days of the 1941 Nazi invasion. The Soviet Union lost around 27 million people between 1941 and 1945,[15] almost half of all World War II deaths.

After some years of dramatic military success, Germany was defeated in 1945, having been invaded by the Soviet Union and Poland from the East and by the United States, the United Kingdom, Canada, and France from the West. After the victory of the Allies in Europe, the war in Asia ended with the Soviet invasion of Manchuria and the dropping of two atomic bombs on Japan by the US, the first nation to develop nuclear weapons and the only one to use them in warfare. In total, World War II left some 60 million people dead.

The mushroom cloud of the detonation of Little Boy, the first nuclear attack in history, on 6 August of 1945 over Hiroshima, igniting the nuclear age with the international security dominating thread of mutual assured destruction in the latter half of the 20th century.

Following World War II, the United Nations, successor to the League of Nations, was established as an international forum in which the world's nations could discuss issues diplomatically. It enacted resolutions on such topics as the conduct of warfare, environmental protection, international sovereignty, and human rights. Peacekeeping forces consisting of troops provided by various countries, with various United Nations and other aid agencies, helped to relieve famine, disease, and poverty, and to suppress some local armed conflicts. Europe slowly united, economically and, in some ways, politically, to form the European Union, which consisted of 15 European countries by the end of the 20th century.

After the war, Germany was occupied and divided between the Western powers and the Soviet Union. East Germany and the rest of Eastern Europe became Soviet puppet states under communist rule. Western Europe was rebuilt with the aid of the American Marshall Plan, resulting in a major post-war economic boom, and many of the affected nations became close allies of the United States.

With the Axis defeated and Britain and France rebuilding, the United States and the Soviet Union were left standing as the world's only superpowers. Allies during the war, they soon became hostile to one another as their competing ideologies of communism and democratic capitalism proliferated in Europe, which became divided by the Iron Curtain and the Berlin Wall. They formed competing military alliances (NATO and the Warsaw Pact) which engaged in a decades-long standoff known as the Cold War. The period was marked by a new arms race as the USSR became the second nation to develop nuclear weapons, which were produced by both sides in sufficient numbers to end most human life on the planet had a large-scale nuclear exchange ever occurred. Mutually assured destruction is credited by many historians as having prevented such an exchange, each side being unable to strike first at the other without ensuring an equally devastating retaliatory strike. Unable to engage one another directly, the conflict played out in a series of proxy wars around the world—particularly in China, Korea, Cuba, Vietnam, and Afghanistan—as the USSR sought to export communism while the US attempted to contain it. The technological competition between the two sides led to substantial investment in research and development which produced innovations that reached far beyond the battlefield, such as space exploration and the Internet.

The international community grew in the second half of the century significantly due to a new wave of decolonization, particularly in Africa. Most of the newly independent states, were grouped together with many other so called developing countries. Developing countries gained attention, particularly due to rapid population growth, leading to a record world population of nearly 7 billion people by the end of the century.

In the latter half of the century, most of the European-colonized world in Africa and Asia gained independence in a process of decolonization. Meanwhile, globalization opened the door for several nations to exert a strong influence over many world affairs. The US's global military presence spread American culture around the world with the advent of the Hollywood motion picture industry and Broadway, jazz, rock music, and pop music, fast food and hippy counterculture, hip-hop, house music, and disco, as well as street style, all of which came to be identified with the concepts of popular culture and youth culture.[16][17][18] After the Soviet Union collapsed under internal pressure in 1991, most of the communist governments it had supported around the world were dismantled—with the notable exceptions of China, North Korea, Cuba, Vietnam, and Laos—followed by awkward transitions into market economies.

Nature of innovation and change

Due to continuing industrialization and expanding trade, many significant changes of the century were, directly or indirectly, economic and technological in nature. Inventions such as the light bulb, the automobile, and the telephone in the late 19th century, followed by supertankers, airliners, motorways, radio, television, air conditioning, antibiotics, nuclear power, frozen food, computers and microcomputers, the Internet, and mobile telephones affected people's quality of life across the developed world. The quantity of goods consumed by the average person expanded massively. Scientific research, engineering professionalization and technological development—much of it motivated by the Cold War arms race—drove changes in everyday life.

Social change

At the beginning of the century, strong discrimination based on race and sex was significant in most societies. Although the Atlantic slave trade had ended in the 19th century, movements for equality for non-white people in the white-dominated societies of North America, Europe, and South Africa continued. By the end of the 20th century, in many parts of the world, women had the same legal rights as men, and racism had come to be seen as unacceptable, a sentiment often backed up by legislation.[19] When the Republic of India was constituted, the disadvantaged classes of the caste system in India became entitled to affirmative action benefits in education, employment and government.

Attitudes toward pre-marital sex changed rapidly in many societies during the sexual revolution of the 1960s and 1970s. Attitudes towards homosexuality also began to change in the later part of the century.

[20][21]

Earth at the end of the 20th century

Economic growth and technological progress had radically altered daily lives. Europe appeared to be at a sustainable peace for the first time in recorded history. The people of the Indian subcontinent, a sixth of the world population at the end of the 20th century, had attained an indigenous independence for the first time in centuries. China, an ancient nation comprising a fifth of the world population, was finally open to the world, creating a new state after the near-complete destruction of the old cultural order. With the end of colonialism and the Cold War, nearly a billion people in Africa were left in new nation states.

The world was undergoing its second major period of globalization; the first, which started in the 18th century, having been terminated by World War I. Since the US was in a dominant position, a major part of the process was Americanization. The influence of China and India was also rising, as the world's largest populations were rapidly integrating with the world economy.

Terrorism, dictatorship, and the spread of nuclear weapons were pressing global issues. The world was still blighted by small-scale wars and other violent conflicts, fueled by competition over resources and by ethnic conflicts.

Disease threatened to destabilize many regions of the world. New viruses such as the West Nile virus continued to spread. Malaria and other diseases affected large populations. Millions were infected with HIV, the virus which causes AIDS. The virus was becoming an epidemic in southern Africa.

Based on research done by climate scientists, the majority of the scientific community consider that in the long term environmental problems pose a serious threat.[22] One argument is that of global warming occurring due to human-caused emission of greenhouse gases, particularly carbon dioxide produced by the burning of fossil fuels.[23] This prompted many nations to negotiate and sign the Kyoto treaty, which set mandatory limits on carbon dioxide emissions.

World population increased from about 1.6 billion people in 1901 to 6.1 billion at the century's end.[24][25]

Wars and politics

Map of territorial changes in Europe after World War I (as of 1923).

The number of people killed during the century by government actions was in the hundreds of millions. This includes deaths caused by wars, genocide, politicide and mass murders. The deaths from acts of war during the two world wars alone have been estimated at between 50 and 80 million. Political scientist Rudolph Rummel estimated 262,000,000 deaths caused by democide, which excludes those killed in war battles, civilians unintentionally killed in war and killings of rioting mobs.[26] According to Charles Tilly, "Altogether, about 100 million people died as a direct result of action by organized military units backed by one government or another over the course of the century. Most likely a comparable number of civilians died of war-induced disease and other indirect effects."[27] It is estimated that approximately 70 million Europeans died through war, violence and famine between 1914 and 1945.[28]

  • The Armenian, Syriac and Greek genocide were the systematic destruction, mass murder and expulsion of the Armenians, Assyrians and Greeks in the Ottoman Empire during World War I, spearheaded by the ruling Committee of Union and Progress (CUP).[29][30]
  • Rising nationalism and increasing national awareness were among the many causes of World War I (1914–1918), the first of two wars to involve many major world powers including Germany, France, Italy, Japan, Russia/USSR, the British Empire and the United States. World War I led to the creation of many new countries, especially in Eastern Europe. At the time, it was said by many to be the "war to end all wars".
  • After gaining political rights in the United States and much of Europe in the first part of the century, and with the advent of new birth control techniques, women became more independent throughout the century.
  • Industrial warfare greatly increased in its scale and complexity during the first half of the 20th century. Notable developments included chemical warfare, the introduction of military aviation and the widespread use of submarines. The introduction of nuclear warfare in the mid-20th century marked the definite transition to modern warfare.
  • Civil wars occurred in many nations. A violent civil war broke out in Spain in 1936 when General Francisco Franco rebelled against the Second Spanish Republic. Many[31] consider this war as a testing battleground for World War II, as the fascist armies bombed some Spanish territories.
  • The Great Depression in the 1930s led to the rise of Fascism and Nazism in Europe.
  • World War II (1939–1945) involved Eastern Asia and the Pacific, in the form of Japanese aggression against China and the United States. Civilians also suffered greatly in World War II, due to the aerial bombing of cities on both sides, and the German genocide of the Jews and others, known as the Holocaust.
  • During World War I, in the Russian Revolution of 1917, 300 years of Romanov reign were ended and the Bolsheviks, under the leadership of Vladimir Lenin, established the world's first Communist state. After the Soviet Union's involvement in World War II, communism became a major force in global politics, notably in Eastern Europe, China, Indochina and Cuba, where communist parties gained near-absolute power.
Richard Nixon and Leonid Brezhnev aboard the USS Sequoia, June 19, 1973
  • The Cold War (1947–1989) involved an arms race and increasing competition between the two major players in the world: the Soviet Union and the United States. This competition included the development and improvement of nuclear weapons and the Space Race. This led to the proxy wars with the Western bloc, including wars in Korea (1950–1953) and Vietnam (1957–1975).
  • The Soviet authorities caused the deaths of millions of their own citizens to eliminate domestic opposition.[32] More than 18 million people passed through the Gulag, with a further 6 million being exiled to remote areas of the Soviet Union.[33]
  • The civil rights movement in the United States and the movement against apartheid in South Africa challenged racial segregation in those countries.
  • The two world wars led to efforts to increase international cooperation, notably through the founding of the League of Nations after World War I, and its successor, the United Nations, after World War II.
  • Nationalist movements in the subcontinent led to the independence and partition of Jawaharlal Nehru-led India and Muhammad Ali Jinnah-led Pakistan.
  • Mahatma Gandhi's nonviolence and Indian independence movement against the British Empire influenced many political movements around the world, including the civil rights movement in the U.S., and freedom movements in South Africa and Burma.
  • The creation of Israel in 1948, a Jewish state in the Middle East, at the end of the British Mandate for Palestine, fueled many regional conflicts. These were also influenced by the vast oil fields in many of the other countries of the predominantly Arab region.
  • The end of colonialism led to the independence of many African and Asian countries. During the Cold War, many of these aligned with the United States, the USSR, or China for defense.
Hong Kong, under British administration from 1842 to 1997, is one of the original Four Asian Tigers.

Culture and entertainment

I and the Village, 1911, by Marc Chagall, a modern painter.
  • As the century began, Paris was the artistic capital of the world, where both French and foreign writers, composers and visual artists gathered. By the middle of the century New York City had become the artistic capital of the world.
  • Theater, films, music and the media had a major influence on fashion and trends in all aspects of life. As many films and much music originate from the United States, American culture spread rapidly over the world.
  • 1953 saw the coronation of Queen Elizabeth II, an iconic figure of the century.
  • Visual culture became more dominant not only in films but in comics and television as well. During the century a new skilled understanding of narrativist imagery was developed.
  • Computer games and internet surfing became new and popular form of entertainment during the last 25 years of the century.
  • In literature, science fiction, fantasy (with well-developed fictional worlds, rich in detail), and alternative history fiction gained popularity. Detective fiction gained popularity in the interwar period. In the United States in 1961 Grove Press published Tropic of Cancer a novel by Henry Miller redefining pornography and censorship in publishing in America.

Music

The Beatles in 1967, a leading music act of Rock music.

The invention of music recording technologies such as the phonograph record, and dissemination technologies such as radio broadcasting, massively expanded the audience for music. Prior to the 20th century, music was generally only experienced in live performances. Many new genres of music were established during the 20th century.

  • Igor Stravinsky revolutionized classical composition.
  • In the 1920s, Arnold Schoenberg developed the twelve-tone technique, which became widely influential on 20th-century composers.
  • In classical music, composition branched out into many completely new domains, including dodecaphony, aleatoric (chance) music, and minimalism.
  • Tango was created in Argentina and became extremely popular in the rest of the Americas and Europe.
  • Blues and jazz music became popularized during the 1910s, 1920s and 1930s in the United States. Bebop develops as a form of jazz in the 1940s.
  • Country music develops in the 1920s and 1930s in the United States.
  • Blues and country went on to influence rock and roll in the 1950s, which along with folk music, increased in popularity with the British Invasion of the mid-to-late 1960s.
  • Rock soon branched into many different genres, including folk rock, heavy metal, punk rock, and alternative rock and became the dominant genre of popular music.
  • This was challenged with the rise of hip hop in the 1980s and 1990s.
  • Other genres such as house, techno, reggae, and soul all developed during the latter half of the century and went through various periods of popularity.
  • Synthesizers began to be employed widely in music and crossed over into the mainstream with new wave music in the 1980s. Electronic instruments have been widely deployed in all manners of popular music and has led to the development of such genres as house, synth-pop, electronic dance music, and industrial.

Film, television and theatre

Charlie Chaplin in his 1921 film The Kid, with Jackie Coogan.

Film as an artistic medium was created in the 20th century. The first modern movie theatre was established in Pittsburgh in 1905.[36] Hollywood developed as the center of American film production. While the first films were in black and white, technicolor was developed in the 1920s to allow for color films. Sound films were developed, with the first full-length feature film, The Jazz Singer, released in 1927. The Academy Awards were established in 1929. Animation was also developed in the 1920s, with the first full-length cel animated feature film Snow White and the Seven Dwarfs, released in 1937. Computer-generated imagery was developed in the 1980s, with the first full-length CGI-animated film Toy Story released in 1995.

Video games

Ralph Baer's Magnavox Odyssey, the first video game console, released in 1972.

Video games—due to the great technological steps forward in computing since the second post-war period—are one of the new forms of entertainment that emerged in the 20th century alongside films.

Art and architecture

The Empire State Building is an iconic building of the 1930s.
  • The art world experienced the development of new styles and explorations such as fauvism, expressionism, Dadaism, cubism, de stijl, surrealism, abstract expressionism, color field, pop art, minimal art, lyrical abstraction, and conceptual art.
  • The modern art movement revolutionized art and culture and set the stage for both Modernism and its counterpart postmodern art as well as other contemporary art practices.
  • Art Nouveau began as a form of architecture and design but fell out of fashion after World War I. The style was dynamic and inventive but unsuited to the depression of the Great War.
  • In Europe, modern architecture departed from the decorated styles of the Victorian era. Streamlined forms inspired by machines became commonplace, enabled by developments in building materials and technologies. Before World War II, many European architects moved to the United States, where modern architecture continued to develop.
  • The automobile increased the mobility of people in the Western countries in the early-to-mid-century, and in many other places by the end of the 20th century. City design throughout most of the West became focused on transport via car.

Sport

  • The popularity of sport increased considerably—both as an activity for all, and as entertainment, particularly on television.
  • The modern Olympic Games, first held in 1896, grew to include tens of thousands of athletes in dozens of sports.
  • The FIFA World Cup was first held in 1930, and was held every four years after World War II.

Science

Mathematics

Multiple new fields of mathematics were developed in the 20th century. In the first part of the 20th century, measure theory, functional analysis, and topology were established, and significant developments were made in fields such as abstract algebra and probability. The development of set theory and formal logic led to Gödel's incompleteness theorems.

Later in the 20th century, the development of computers led to the establishment of a theory of computation.[40] Computationally-intense results include the study of fractals[41] and a proof of the four color theorem in 1976.[42]

Physics

Astronomy

  • A much better understanding of the evolution of the universe was achieved, its age (about 13.8 billion years) was determined, and the Big Bang theory on its origin was proposed and generally accepted.
  • The age of the Solar System, including Earth, was determined, and it turned out to be much older than believed earlier: more than 4 billion years, rather than the 20 million years suggested by Lord Kelvin in 1862.[43]
  • The planets of the Solar System and their moons were closely observed via numerous space probes. Pluto was discovered in 1930 on the edge of the solar system, although in the early 21st century, it was reclassified as a dwarf planet instead of a planet proper, leaving eight planets.
  • No trace of life was discovered on any of the other planets orbiting the Sun (or elsewhere in the universe), although it remained undetermined whether some forms of primitive life might exist, or might have existed, somewhere in the Solar System. Extrasolar planets were observed for the first time.

Agriculture

Wheat yields greatly increased from the Green Revolution in the world's least developed countries.
  • Norman Borlaug fathered the Green Revolution, the set of research technology transfer initiatives occurring between 1950 and the late 1960s that increased agricultural production in parts of the world, beginning most markedly in the late 1960s, and is often credited with saving over a billion people worldwide from starvation.

Biology

Medicine

A stamp commemorating Alexander Fleming. His discovery of penicillin changed the world of medicine by introducing the age of antibiotics.

Notable diseases

  • An influenza pandemic, Spanish Flu, killed anywhere from 17 to 100 million people between 1918 and 1919.
  • A new viral disease, called the Human Immunodeficiency Virus, or HIV, arose in Africa and subsequently killed millions of people throughout the world. HIV leads to a syndrome called Acquired Immunodeficiency Syndrome, or AIDS. Treatments for HIV remained inaccessible to many people living with AIDS and HIV in developing countries, and a cure has yet to be discovered.
  • Because of increased life spans, the prevalence of cancer, Alzheimer's disease, Parkinson's disease, and other diseases of old age increased slightly.
  • Changes in food production, along with sedentary lifestyles due to labor-saving devices and the increase in home entertainment, contributed to an "epidemic" of obesity, at first in the rich countries, but by the end of the 20th century spreading to the developing world.

Energy and the environment

Oil field in California, 1938. The first modern oil well was drilled in 1848 by Russian engineer F.N. Semyonov, on the Apsheron Peninsula north-east of Baku.
  • Fossil fuels and nuclear power were the dominant forms of energy sources.
  • Widespread use of petroleum in industry—both as a chemical precursor to plastics and as a fuel for the automobile and airplane—led to the geopolitical importance of petroleum resources. The Middle East, home to many of the world's oil deposits, became a center of geopolitical and military tension throughout the latter half of the century. (For example, oil was a factor in Japan's decision to go to war against the United States in 1941, and the oil cartel, OPEC, used an oil embargo of sorts in the wake of the Yom Kippur War in the 1970s).
  • The increase in fossil fuel consumption also fueled a major scientific controversy over its effect on air pollution, global warming, and global climate change.
  • Pesticides, herbicides and other toxic chemicals accumulated in the environment, including in the bodies of humans and other animals.
  • Population growth and worldwide deforestation diminished the quality of the environment.
  • In the last third of the century, concern about humankind's impact on the Earth's environment made environmentalism popular. In many countries, especially in Europe, the movement was channeled into politics through Green parties. Increasing awareness of global warming began in the 1980s, commencing decades of social and political debate.

Engineering and technology

First flight of the Wright brothers' Wright Flyer on December 17, 1903, in Kitty Hawk, North Carolina; Orville piloting with Wilbur running at wingtip.

One of the prominent traits of the 20th century was the dramatic growth of technology. Organized research and practice of science led to advancement in the fields of communication, electronics, engineering, travel, medicine, and war.

  • Basic home appliances including washing machines, clothes dryers, furnaces, exercise machines, dishwashers, refrigerators, freezers, electric stoves and vacuum cleaners became popular from the 1920s through the 1950s. Radios were popularized as a form of entertainment during the 1920s, followed by television during the 1950s.
  • The first airplane, the Wright Flyer, was flown in 1903. With the engineering of the faster jet engine in the 1940s, mass air travel became commercially viable.
  • The assembly line made mass production of the automobile viable. By the end of the 20th century, billions of people had automobiles for personal transportation. The combination of the automobile, motor boats and air travel allowed for unprecedented personal mobility. In western nations, motor vehicle accidents became the greatest cause of death for young people. However, expansion of divided highways reduced the death rate.
  • The triode tube was invented.
  • Air conditioning of buildings became common
  • New materials, most notably stainless steel, Velcro, silicone, teflon, and plastics such as polystyrene, PVC, polyethylene, and nylon came into widespread use for many various applications. These materials typically have tremendous performance gains in strength, temperature, chemical resistance, or mechanical properties over those known prior to the 20th century.
  • Aluminum became an inexpensive metal and became second only to iron in use.
  • Thousands of chemicals were developed for industrial processing and home use.
  • Digital computers came into use

Space exploration

Photo of American astronaut Buzz Aldrin during the first moonwalk in 1969, taken by Neil Armstrong. The relatively young aerospace engineering industries rapidly grew in the 66 years after the Wright brothers' first flight.
  • The Space Race between the United States and the Soviet Union gave a peaceful outlet to the political and military tensions of the Cold War, leading to the first human spaceflight with the Soviet Union's Vostok 1 mission in 1961, and man's first landing on another world—the Moon—with America's Apollo 11 mission in 1969. Later, the first space station was launched by the Soviet space program. The United States developed the first reusable spacecraft system with the Space Shuttle program, first launched in 1981. As the century ended, a permanent manned presence in space was being founded with the ongoing construction of the International Space Station.
  • In addition to human spaceflight, unmanned space probes became a practical and relatively inexpensive form of exploration. The first orbiting space probe, Sputnik 1, was launched by the Soviet Union in 1957. Over time, a massive system of artificial satellites was placed into orbit around Earth. These satellites greatly advanced navigation, communications, military intelligence, geology, climate, and numerous other fields. Also, by the end of the 20th century, unmanned probes had visited or flew by the Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and various asteroids and comets, with Voyager 1 being the farthest man made object from Earth at 23,5 billion kilometers away from Earth as of 6th of September 2022, and together with Voyager 2 both carrying The Voyager Golden Record containing sounds, music and greetings in 55 languages as well as 116 images of nature, human advancement, space and society.
  • The Hubble Space Telescope, launched in 1990, greatly expanded our understanding of the Universe and brought brilliant images to TV and computer screens around the world.
  • The Global Positioning System, a series of satellites that allow land-based receivers to determine their exact location, was developed and deployed.[47]

Religion

Economics

  • The Great Depression was a worldwide economic slowdown that lasted throughout the early 1930s.
  • The Soviet Union implemented a series of five-year plans for industrialization and economic development.
  • Most countries abandoned the gold standard for their currency. The Bretton Woods system involved currencies being pegged to the United States dollar; after the system collapsed in 1971 most major currencies had a floating exchange rate.

See also

  • 20th-century inventions
  • Death rates in the 20th century
  • Infectious disease in the 20th century
  • Modern art
  • Short twentieth century
  • Timelines of modern history
  • List of 20th-century women artists
  • List of notable 20th-century writers
  • List of 20th-century American writers by birth year
  • List of battles 1901–2000
  • List of stories set in a future now past

References

  1. "Twentieth Century's Triumphant Entry". The New York Times. January 1, 1901. p. 1. Retrieved 2021-01-03.
  2. Wilson, E.O., The Future of Life (2002) (ISBN 0-679-76811-4). See also: Leakey, Richard, The Sixth Extinction : Patterns of Life and the Future of Humankind, ISBN 0-385-46809-1
  3. "The Sixth Extinction – The Most Recent Extinctions". Archived from the original on 2015-12-18.
  4. Johnston, Louis; Williamson, Samuel H. (2022). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved February 12, 2022. United States Gross Domestic Product deflator figures follow the Measuring Worth series.
  5. "World Population to Hit Milestone With Birth of 7 Billionth Person". PBS NewsHour. 27 October 2011. Retrieved 11 February 2018.
  6. "World population hits 6 billion". NBC News. 4 March 2004. Retrieved 11 February 2018.
  7. American Museum of Natural History. "Human Population Through Time". youtube.com. Retrieved 1 June 2022.
  8. "Religions and babies | Hans Rosling" via www.youtube.com.
  9. "Commemorating Smallpox Eradication – a legacy of hope, for COVID-19 and other diseases". World Health Organization. 2020-05-08. Archived from the original on 2022-01-15.
  10. Kritz, Fran (2019-09-19). "Russian Lab Explosion Raises Question: Should Smallpox Virus Be Kept Or Destroyed?". NPR. Retrieved 2022-01-15.
  11. "Quiz: Population 7 Billion – Could We All Fit in One City?". 30 October 2011. Retrieved 11 February 2018.
  12. "The 21st Century and the 3rd Millennium When Did They Begin?". United States Naval Observatory. Archived from the original on 2019-10-02. Retrieved 2013-06-07.
  13. Pinker, Stephen (2011). The Better Angels of Our Nature. Viking. ISBN 978-0-670-02295-3.
  14. Ferguson, Niall (2004). Empire: The rise and demise of the British world order and the lessons for global power. New York: Basic Books. ISBN 978-0-465-02328-8.
  15. Mark Harrison (2002). Accounting for War: Soviet Production, Employment, and the Defence Burden, 1940–1945. Cambridge University Press. p. 167. ISBN 0-521-89424-7
  16. Delaney, Tim. "Pop Culture: An Overview". Philosophy Now. Retrieved 12 September 2022.
  17. Bell, P., R. (1996). ""Americanization": Political and cultural examples from the perspective of "Americanized" Australia" (PDF). American Studies. Retrieved 12 September 2022.
  18. Malchow, Howard (2011). Special Relations: The Americanization of Britain?. Stanford University Press. ISBN 978-0-804-77399-7.
  19. Fleegler, Robert L. Theodore G. Bilbo and the Decline of Public Racism, 1938–1947 Archived 2009-02-06 at the Wayback Machine. Retrieved 23 December 2014
  20. Zadey, Siddhesh (2019-11-25). "Constitution Day: Do We Truly Know the 'Real' Ambedkar?". TheQuint. Retrieved 2021-07-30.
  21. "Ambedkar and political reservation". The Indian Express. 2020-08-16. Retrieved 2021-07-30.
  22. Smith, J.B.; et al. "Ch. 19. Vulnerability to Climate Change and Reasons for Concern: A Synthesis". Extreme and Irreversible Effects. Sec 19.6. Archived from the original on 2016-10-18. Retrieved 2014-07-10., in IPCC TAR WG2 2001
  23. IPCC AR5 WG1 2013, "Summary for Policymakers, Observed Changes in the Climate System", pp. 10–11: "Total radiative forcing is positive, and has led to an uptake of energy by the climate system. The largest contribution to total radiative forcing is caused by the increase in the atmospheric concentration of CO2 since 1750." (p 11). "From 1750 to 2011, CO2 emissions from fossil fuel combustion and cement production have released 375 [345 to 405] GtC to the atmosphere, while deforestation and other land use change are estimated to have released 180 [100 to 260] GtC." (p. 10).
  24. "World Population: Historical Estimates of World Population". United States Census Bureau. December 19, 2013. Retrieved 2015-01-09.
  25. "World Population: Total Midyear Population for the World: 1950–2050". United States Census Bureau. December 19, 2013. Retrieved 2015-01-09.
  26. Democide See various exclusions
  27. Charles Tilly (2003). "The politics of collective violence" Cambridge University Press. p. 55. ISBN 0-521-53145-4.
  28. Gary Rodger Weaver (1998). Culture, Communication, and Conflict. Simon & Schuster. p. 474. ISBN 0-536-00373-4
  29. Suny 2015, pp. 245, 330.
  30. Bozarslan, Duclert & Kévorkian 2015, p. 187.
  31. Prominent among this group was the late Tony Judt.
  32. Geoffrey A. Hosking (2001). "Russia and the Russians: a history". Harvard University Press. p. 469. ISBN 0-674-00473-6
  33. "The Other Killing Machine". The New York Times. May 11, 2003
  34. "China's great famine: 40 years later". British Medical Journal 1999;319:1619–1621 (December 18 )
  35. Thee, Marek (1976). "The Indochina Wars: Great Power Involvement – Escalation and Disengagement". Journal of Peace Research. Sage Publications. 13 (2): 117–129. doi:10.1177/002234337601300204. ISSN 1460-3578. JSTOR 423343. S2CID 110243986.
  36. "You saw it here first: Pittsburgh's Nickelodeon introduced the moving picture theater to the masses in 1905". Pittsburgh Post-Gazette. 18 June 2005. Retrieved 11 February 2018.
  37. Jason Whittaker (2004), The cyberspace handbook, Routledge, p. 122, ISBN 978-0-415-16835-9
  38. Coates, James (May 18, 1993). "How Mario Conquered America". Chicago Tribune. Archived from the original on November 23, 2015. Retrieved February 7, 2018.
  39. "PlayStation 2 Breaks Record as the Fastest Computer Entertainment Platform to Reach Cumulative Shipment of 100 Million Units" (PDF) (Press release). Sony Computer Entertainment. 30 November 2005. Archived from the original (PDF) on 3 January 2006. Retrieved 8 June 2008.
  40. Boyer, Carl B. (1991). A history of mathematics. Merzbach, Uta C., 1933–, Rogers D. Spotswood Collection. (2nd ed. [rev.] ed.). New York: Wiley. ISBN 978-0471543978. OCLC 23823042.
  41. Devaney, Robert L. (1998). A first course in chaotic dynamical systems : theory and experiment (6. printing. ed.). Reading, Mass. [u.a.]: Addison-Wesley. ISBN 978-0-201-55406-9.
  42. Kenneth Appel; Wolfgang Haken (26 July 1976). "Every Planar Map is Four-Colorable". Bulletin of the American Mathematical Society. Contemporary Mathematics. 98. doi:10.1090/conm/098. ISBN 9780821851036. S2CID 8735627.
  43. Thomson, Sir William (1862). "On the Age of the Sun's Heat". Macmillan's Magazine. 5: 288–293.
  44. "The Nobel Prize in Physiology or Medicine 1962". NobelPrize.org. Nobel Media AB. Retrieved November 5, 2011.
  45. "James Watson, Francis Crick, Maurice Wilkins, and Rosalind Franklin". Science History Institute. June 2016. Archived from the original on 21 March 2018. Retrieved 20 March 2018.
  46. Engel, Pamela (April 23, 2014). "Watch How Quickly The War On Drugs Changed America's Prison Population". Business Insider.
  47. "Global Positioning System History". 2012-10-27. Retrieved 2018-02-07.

Sources

Further reading

  • Brower, Daniel R. and Thomas Sanders. The World in the Twentieth Century (7th Ed, 2013)
  • CBS News. People of the century. Simon and Schuster, 1999. ISBN 0-684-87093-2
  • Grenville, J. A. S. A History of the World in the Twentieth Century (1994). online free
  • Hallock, Stephanie A. The World in the 20th Century: A Thematic Approach (2012)
  • Langer, William. An Encyclopedia of World History (5th ed. 1973); highly detailed outline of events online free
  • Morris, Richard B. and Graham W. Irwin, eds. Harper Encyclopedia of the Modern World: A Concise Reference History from 1760 to the Present (1970) online
  • Pindyck, Robert S. "What we know and don’t know about climate change, and implications for policy." Environmental and Energy Policy and the Economy 2.1 (2021): 4–43. online
  • Pollard, Sidney, ed. Wealth and Poverty: an Economic History of the 20th Century (1990), 260 pp; global perspective online free
  • Stearns, Peter, ed. The Encyclopedia of World History (2001)
  • UNESCO (February 28, 2008). "The Twentieth Century". History of Humanity. Vol. VII. Routledge. p. 600. ISBN 978-0-415-09311-8.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.