 Conquest of neighboring tribes and territories occurred between 1401 and 1450, absorbing peoples with different cultures and languages into the empire.By the late 15th century, this state rivaled that of the Aztecs, expanding their territory over much of what is now Michoacán and into part of Colima, Nayarit, Querétaro, Guanajuato, Guerrero and Jalisco.The Aztecs attempted to invade Purépecha but were repelled.