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Teotihuacán had a population between 150,000 and 200,000 people and was a thriving trade center.
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After years of growth the city abrubtly declined. Historians think this may have been due to an invasion by outside forces or conflict among the ruling classes
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Toltecs rose to power and ruled over Mexico from the city of Tula.
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Topiltzin called on the Toltecs to end the practice of human sacrifice. He also encouraged them to worship a different god called Quetzalcoatl.
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The Aztecs arrived in the Valley of Mexico.The valley contained a number of small city-states that had survived the collapse of Toltec rule.
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Topiltzin and his followers were forced into exile on the Yucatán Peninsula. After his exile, Toltec power began to decline and by the early 1200s, their reign ended.
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Aztecs founded a city place on a small island in Lake Texcoco that they called Tenochtitlán
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Tenochtitlán joined with two other city-states—Texcoco and Tlacopan to form an alliance
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Tenochtitlán became a large urban center with a population of between 200,000 and 400,000 people. It was larger than London or any other European capital of the time.
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Montezuma II became rule and under him the Aztec Empire began to weaken. Montezuma called for even more sacrifice than the Aztecs were already giving. This led up to the end of the Aztec empire.
