The Aztec lived on swampy land and it was hard to grow crops. They had to make chanapas so they could grow crops.
The Aztecs thought they needed human sacrifieces to please their gods. They tied one leader down on a rock and it took 8 men to finally take him down. The Aztecs would rip your heart out and be as bloody as possible.
The spanish came over and wanted to over take them. The spanish did not have enough men so they gave the Aztecs dieseases to over take them. There was constant warfare here and it did not help in any case.