What role did other tribes play in the defeat of the Aztecs and Incans?

Other tribes played a crucial role in the defeat of both the Aztecs and Incas by forming alliances with the Spanish conquistadors. Many indigenous groups resented the dominance and tribute demands of the Aztecs and Incas, which led them to support the Spanish in hopes of overthrowing their oppressors. This collaboration provided the conquistadors with additional manpower and local knowledge, significantly aiding their military campaigns. Additionally, the spread of diseases brought by Europeans weakened the native populations, further facilitating the conquest.