In 1907, Michoacán's boundaries changed again with the addition of the communities of Pungarabato and Zirandaro added from Guerrero state to make the Balsas River a natural border. The Mexican Revolution came to Michoacán in 1911, when those loyal to Francisco I. Madero proclaimed Santa Clara del Cobre as their territory, then went on to take towns around Lake Patzcuaro under the leadership of Salvador Escalante. The governor of the state, Aristeo Mendoza, resigned. Fighting among various factions would continue in parts of the state for the rest of the war. The state's current constitution was ratified in 1918. In 1920, the Universidad Michoacana de San Nicolás de Hidalgo was founded.