The Mexican Revolution sparked the Constitution of 1917 which provided for separation of Church and state, government ownership of the subsoil, holding of land by communal groups, the right of labor to organize and strike and many other aspirations. Like most constitutions, it was a statement of what the delegates wanted for Mexicans and not what could be put in place immediately. Obregón thought the pace of reform was too slow under Carranza; he revolted and soon after the President was assassinated. Obregón himself was elected President in 1920, reformed land holding in Morelos and Yucatan, and worked to improve Mexico’s financial situation. Obregón was reelected in 1928, only to be killed by a supporter of the pro-Catholic opposition before he took office.