Because the Aztecs thought that Huitzilopochtli (chief god) required human blood for survival.
why do you think so many indians groups join the Spanish against the Aztecs
Many more peoples sacrifies the stone age life was natureful and the stone age mans eat to the nature food.
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The Aztecs became extremely wealthy because they conquered many people and received tribute payments.
Because European explorers carried the diseases with them on their voyages. The Aztecs bodies had no way of fighting an unknown disease, so many of them simply died from the exposure.
the Aztecs did use horses in many unusally ways. But it took them a while to be informed of the creatures, so they weren't the first.
Cortez had many advantages on the Aztecs. For one, when he first got there, the Aztecs thought he was their god Quetzelcoatl. They took him in which allowed him to get into the city. They were a more primative civilization so they did not have the weapons that Cortez had.
It was so that the Spain's. Invaded so that they could get the gold that the Aztecs had.
The Spaniards appeared to be nice to the Aztecs so they treated them nicely until Cortez betrayed the Aztecs.
The Aztecs used humans as sacrifices. They particularly used prisoners from war as sacrifices so part of their tactic was to not kill the enemy so they can sacrifice him later.
because they were keeping the Aztecs kept them alive.
Humans have hands and need entertainment so why not?