Question

Did the spanish able to overpower the aztecs and the incas

Answer 1

According to The Biography Channel, Spanish explorer Francisco Pizarro was able to defeat the Inca easily because the Incans were embroiled in their own civil war and suffering from the smallpox epidemic, both of which had dramatically weakened the Incan empire. This made it easy for Pizzaro to take the last Incan Emperor, Atahuallpa, prisoner and execute him, paving the way for complete conquest.

Answer 2

Yes, they did overpower the Aztecs and the Incas. They had more sophisticated weapons and spread a disease, known as the cold and smallpox, that was for the Aztecs.  For the Incas, it was overpowered more passively, and they already were in a civil war so that weakened the Incas already. They executed the Incan empire.