Answer:
Terrorism is using violence or the threat of violence against civilians for political goals. It has been used in the 21st century against a number of countries. Some examples of terrorism are the 9/11 attacks in America, and an attack in Paris as well, and that's just a few of the attacks. There has been a 61% increase in terrorist attacks in the past year.
I will give my best shot. I think they justified their reason to conquer the Aztec and Inca Empires in the name of their religion, christianity