Pedro Pascual Segura

A rancher and soldier, educated and with a firm character, Segura brought order to the province after the pointless cruelties that Aldao had inflicted. He allowed some of the Unitarians to return to the province. During his tenure as governor, Segura had a conflict with the government of Chile. He asked for assistance from Juan Manuel de Rosas, governor of Buenos Aires province and effective ruler of the Argentina Confederation.

In 1847 Segura wrote to the Pope asking him to erect a diocese in his province, which at that time depended on the diocese of San Juan. For that reason, Dr. Bernardo de Irigoyen, Argentina's ambassador to Chile, who was residing in Mendoza, organized a coup by which Segura was deposed on 4 April 1847 and replaced by an obscure local commander, Alejo Mallea. Segura retired to a ranch on the outskirts of Mendoza and was not disturbed.

When news of the Battle of Caseros (3 February 1852) reached Mendoza, the legislature decided that Mallea was too closely identified with the defeated Rosas, so they deposed him. Instead they elected Segura. It is clear from the official documents that he considered this was a continuation of his first governorship. He took office on 3 March 1852, and refused to take the oath of office, as he felt that his former oath still applied. Segura signed the San Nicolás Agreement on 31 May 1852, which established the Argentine Confederation with all the provinces of modern Argentina apart from Buenos Aires Province. Soon after the legislature promoted him to the rank of General.

Segura carried out a moderate government, and prohibited the use of party symbols. He officially adopted the national flag as the only one that should be used the province. He helped to restore General Nazario Benavídez as governor of the neighboring government of San Juan after he had been deposed in a coup. Segura authorized use of Chilean copper coins, established a new state printing shop and swore to observe the Constitution of Argentina of 1853. He made numerous visits to the interior of the province. He founded schools and colleges, courts, prison and other institutions. He sanctioned the first provincial constitution.

At the end of 1855 Segura resigned his government, calling elections. On 22 February 1856 he handed over power to his successor, Juan Cornelio Moyano.