 In the following years first the Tarascan Sierra and then the Balsas River was incorporated into the increasingly centralized state.Under the rule of "cazonci" Tzitzipandáquare a number of regions were conquered, only to be lost again by rebellions or strategic retreats when confronted with Aztec expansion.In 1460 the Tarascan state reached the Pacific coast at Zacatula, advanced into the Toluca Valley, and also, on the northern rim, reached into the present day state of Guanajuato.