The central point was that the Spanish conquerors beat the native Indians very easily because the Indians did not think of themselves as unique individuals. The Indians thought they were each part of the body of the emperor. They pretty much thought that they could do only what emperor told them and that their purpose in life was to better the whole society by serving the emperor. They did not believe they could think for themselves as individuals. That’s why they all pretty much gave up when the emperor was captured. They didn’t know what to do without the emperor. It was like the emperor was the brain of the body which was society. Their society couldn’t function without the emperor.
The truth is that nobody during the Middle Ages thought the earth was flat. This myth was made up in an attempt to take a stab at Christianity and the Catholic Church in the Middle Ages. People had calculated the circumference of the earth a long time ago and obviously you can’t have a circumference unless the earth is a sphere.