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Natural land bridges formed when water levels dropped during the Ice Age.
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The land bridge was covered with water once again, leaving hunters and gatherers in the Americas.
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People started planting around in what is now central Mexico.
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The Olmec people lived along the Gulf Coast of what is now southern Mexico.
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The Adena people, one of the first Mound Builders, lived along the Ohio River.
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The Mayan culture existed in what is now southern Mexico and Guatemala.
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The Hopewell Mound Builders lodged along the Ohio River.
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The Anasazi culture emerged in the Southwest in the Four Corners area (where Utah, Colorado, New Mexico, and Arizona meet).
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The Cahokia lived along the Mississippi River.
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The Aztecs settled in the Valley of Mexico.
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The Incas established their empire in southern Peru.
