This collection comprises U.S. State Department documents related to the Mexican Revolution, which began in 1910 and continued sporadically until the new Constitution was adopted in 1917, through to and including the election of Calles. There are accounts of major military and political events, such as the growing opposition in 1910 to the regime of Porfirio Diaz; the forced resignation of Diaz in 1911 and the election of the revolutionary leader, Francisco I. Madero, as President; the assassination of Madero in 1913, followed by the military dictatorship of Victoriano Huerta; the growing unrest and the revolt against Huerta that brought about his resignation in July 1914; the arrest of American marines at Tampico and the military occupation of Veracruz by the U.S. in April 1914; the Convention at Aguascalientes in the latter part of 1914, an unsuccessful attempt by the revolutionary leaders Venustiano Carranza, Francisco "Pancho" Villa, and Emiliano Zapata to settle their differences; the defeat of Villa in 1915 by the Carranza forces under command of Alvaro Obregon and the de facto recognition by the United States of the Mexican Government under Carranza; the U. S. expedition into Mexico under General Pershing to pursue Villa after his raids across the border in March 1916; the revolt resulting in the death of Carranza in 1920 and the election of Obregon as President; the de jure recognition of Mexico by the U.S. in 1923; and the election of Plutarco Elias Calles as President in 1924.