 During the Spanish Conquest of the Aztecs, the Chalca allied themselves with Hernán Cortés and his troops.Under the presidency of Porfirio Díaz, much of the drained lake bed formed part of a latifundia, the Hacienda de Xico.Following the Mexican Revolution, land ownership was reformed into the "ejido" system of communal ownership, and was utilized primarily for dairy farming by the communal owners, or "ejidatarios".