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The Aztecs were the Native American people who dominated northern Mexico at the time of the Spanish conquest in the early 16th century. A nomadic culture, the Aztecs eventually settled on several small islands in Lake Texcoco where, in 1325, they founded the town of Tenochtitlan, modern-day Mexico City. The Aztec civilization is known for being the last of the great Mesoamerican cultures before the Europeans arrived. They built impressive temple pyramids, used sophisticated techniques of agriculture, their eagle warriors built a great empire, and they made human sacrifices to their gods. The Aztecs (/ˈæztɛks/) were a Mesoamerican culture that flourished in central Mexico in the post-classic period from 1300 to 1521. Staples of their diet were maize, beans and squash. To these, they added chillies and tomatoes. They also harvested Acocils, an abundant crayfish-like creature found in Lake Texcoco, as well as Spirulina algae which they made into cakes. Invaders led by the Spanish conquistador Hernán Cortés overthrew the Aztec Empire by force and captured Tenochtitlan in 1521, bringing an end to Mesoamerica's last great native civilization.