The Aztec civilization came to an end after the arrival of the Spanish in the Americas. Spanish conquistador Hernan Cortes led a number of attacks against the Aztec capital of Tenochtitlan with the help of native people who were enemies of the Aztecs. The Aztec ruler, Montezuma, was killed by Cortes's army in 1520, and the entire city was eventually destroyed in 1521. The Spanish also introduced smallpox, a deadly virus, to the Aztecs. The Aztecs bodies’ had no immunity to this virus, and between 10 and 50 percent of the Aztec population in Tenochtitlan died from the illness. The surviving Aztec people remained in the region and their descendants can still be found in parts of modern Mexico.
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