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In page History of Mexico:

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The Mexica people arrived in the Valley of Mexico in 1248 CE. They had migrated from the deserts north of the Rio Grande[citation needed] over a period traditionally said to have been 100 years. They may have thought of themselves as the heirs to the prestigious civilizations that had preceded them.[citation needed] What the Aztecs initially lacked in political power, they made up for with ambition and military skill. In 1325, they established the biggest city in the world, Tenochtitlan.