Alabama police in 1965 attack voting rights marchers participating in the first of the Selma to Montgomery marches, which became known as "Bloody Sunday."
With the nation paying increasing attention to Selma and voting rights, President Johnson reversed announced he would send a proposal of voting rights legislation to Congress.
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https://en.wikipedia.org/wiki/Voting_Rights_Act_of_1965#/media/File:Bloody_Sunday-Alabama_police_attack.jpeg
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