On April 23, 1519, the armada commanded by Hernán Cortés, landed near Santa Cruz. Quickly, after a first contact with the Maya, the conquistador rushes to the assault of the aztec empire. It was a real butchery. But even more than the weapons of the Spanish, what were the viruses and the germs which decimated the Aztecs. Three epidemic waves have swept away 90 % of the indigenous population. The 1520 (smallpox) with 8 million deaths ; that of 1545 (typhus ?) with 12 million to 15 million victims ; and, finally, that of 1576, with 2 million dead. It is repeated that the Indie…