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Two thousand years ago, some of the largest culture groups in North America were the Puebloan groups, centered in the current-day Greater Southwest (the southwestern United States and northwestern Mexico), the Mississippian groups located along the Great River and its tributaries, and the Mesoamerican groups of the areas now known as central Mexico and the Yucatán. Previous developments in agricultural technology enabled the explosive growth of the large early societies, such as that at Tenochtitlán in the Valley of Mexico, Cahokia along the Mississippi River, and in the desert oasis areas of the Greater Southwest

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