Uruguay
20th century

The Colorado leader José Batlle y Ordóñez was elected president in 1903. The following year, the Blancos led a rural revolt, and eight bloody months of fighting ensued before their leader, Aparicio Saravia, was killed in battle. Government forces emerged victorious, leading to the end of the co-participation politics that had begun in 1872. Batlle had two terms (1903–07 and 1911–15) during which, taking advantage of the nation's stability and growing economic prosperity, he instituted major reforms, such as a welfare program, government participation in many facets of the economy, and a plural executive.

Gabriel Terra became president in March 1931. His inauguration coincided with the effects of the Great Depression, and the social climate became tense as a result of the lack of jobs. There were confrontations in which police and leftists died. In 1933, Terra organized a coup d'état, dissolving the General Assembly and governing by decree. A new constitution was promulgated in 1934, transferring powers to the president. In general, the Terra government weakened or neutralized economic nationalism and social reform.

In 1938, general elections were held, and Terra's brother-in-law, General Alfredo Baldomir, was elected president. Under pressure from organized labor and the National Party, Baldomir advocated free elections, freedom of the press, and a new constitution. Although Baldomir declared Uruguay neutral in 1939, British warships and the German ship Admiral Graf Spee fought a battle not far off Uruguay's coast. The Admiral Graf Spee took refuge in Montevideo, claiming sanctuary in a neutral port, but was later ordered out.

In 1945, Uruguay formally signed the Declaration by the United Nations and entered World War II, leading the country to declare war on Germany and Japan. Following the end of the war, it became a founding member of the United Nations.

In the late 1950s, partly because of a worldwide decrease in demand for Uruguayan agricultural products, Uruguayans suffered a steep drop in their standard of living, leading to student militancy and labor unrest. An armed group of Marxist–Leninist urban guerrillas, known as the Tupamaros, emerged in the 1960s, engaging in activities such as bank robbery, kidnapping, and assassination, in addition to attempting an overthrow of the government.
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