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When Hernan Cortes first arrived in Tenochtitlan in 1519, Moctezuma, the ruler of the Aztecs, agreed to let Cortes stay. However, a year later, in 1520, the Aztecs rose and threw Cortes out of the city. Later on, Moctezuma was killed, most probably by the Aztecs. Later on, in 1521, Cortes came back with his army, and he defeated the Aztecs with the help of:

Metal armor

Smallpox (people think that more than 1,000 Aztecs died because of Smallpox)

Muskets

Horses (the Aztecs had never seen horses before, and they got frightened)

Allies

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12y ago

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