Cortes had a whole civilization behind him. Hundreds to thousands of years of people trading ideas and creating more and better tech. Aztecs were just isolated

Cortes had a whole civilization behind him. Hundreds to thousands of years of people trading ideas and creating more and better tech. Aztecs were just isolated by themselves with a handful of other natives since they arrived in North America. Obviously the side with better tech will always win, and that's why it only took a few hundred Spaniards to take over hundreds of thousands of Aztecs.