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The Aztecs sacrificed people by the thousands. It is estimated that by the time the Spaniards came, they sacrificed over 50,000 people every year.

Their main God was the God of war and the sun. This was a dangerous combination. It meant that every morning he had to fight away the monsters of the night, which were the moon and the stars. But to do this, he needed a cintunal supply of food and energy, and his favourite delicacies were human blood and hearts. To keep a supply of humans available to sacrifice, the Aztecs had to keep on conquering more and more tribes.

(video by Omar and Alvaro, commentary by their dad)