Carranza War

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Point of Divergence
Mexican President Carranza to consolidate his power, went on to co-operation with Germany, invited into the country by the German military advisers to help against his adversaries. This caused in U.S. anti-German hysteria. In such a situation, Carranza began negotiations with Germany on a joint war against the United States, fearing for his power. By 1914, the U.S. army was mobilized and was located on the Mexican border and the U.S. government began to support socialist Villa and Zapata. After the Germans flooded of ship "Lusitania", which was carrying weapons for the Entente in Europe, 10 may President Woodrow Wilson declared war on German Empire and Mexico

US invasion in Mexico; Socialist Mexico
In May 1915 supporters of Pancho Villa, with the support of Americans revolted throughout Mexico, at the same time, U.S. troops took the capital of Mexico, the same city. Villa in the summer is already controlled most of the country, and in september, the commander of the Mexican army, Alvaro Obregon, issued Americans Carranza with German representatives and acknowledged government of Vilia and Zapata. By 1916 Mexican Civil War ended- Vilia winned and announced of Mexican Socialist States

U.S. did not like the socialist government of Villa, but the Americans did not want to return to power of Carranza or his predecessor Worth, leader of the right-wing reactionaries. In addition, the U.S. was convinced that socialism is not viable and the new Mexican regime will collapse easily. Therefore, the U.S. recognized the Mexican government in return for that Mexico has declared war on German Empire (nominal). The new government established the ruling Revolutionary Socialist Party of Mexico, whose head, Villa, was concurrently the head of state and dictator, established single-party state

In 1920, after the death of Villa, Mexican new leader, Emiliano Zapata, continued the policy of socialism, although legalized opposition. Mexico became a multiparty state, which remained before the coup of Alvaro Obregon in 1928