On December 1, 1920, General Álvaro Obregón of Sonora became President of Mexico. During the previous May, his supporters had staged a popular coup d'etat which paved the way for his constitutional election. Mexico was then in the throes of revolutionary ferment, and the instability which had accompanied Obregón's ascendancy to Executive Office also threatened to attend his demise. Obregón thus sought to achieve political and social reforms which would strengthen his regime and allow for a peaceful Presidential succession in 1924. As the major institution of coercion during a time of revolutionary violence, the Army had emerged as the most important political institution in Mexico. Although part of a broader political effort which included labor, agrarian and administrative reforms, Obregón's military reconstruction can be viewed as the important keystone in his attempt to consolidate control of Mexico. Obregón’s military reforms sought to insure, first, Army loyalty to the office of President, and, second, military effectiveness when the Army would be called upon to defend the Federal Government. His reforms grew out of the Agua Prieta movement of May 1920, and continued throughout his own administration. As President, Obregón gave intensive attention to military affairs and his military reforms were the most significant achievement of his broadly based effort to consolidate the Mexican Revolution.