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The Americas: Pre-History to 1600 The American Indians Early American Regions People migrated from Serbia via the Bering Strait Land Bridge. Arrived during last Ice Age about 15,000 years ago. People were hunters pursuing large game. 5,000 years later, ice melts, sea levels rise to present day, covering land bridge. American Indians Paleo-Indian Hunters adapt to climate change. Population grows and expands across the Americas. Regions influenced culture. Rise of Permanents Cities 9,000 years ago, Agricultural Revolution. Vegetables, domestication of animals, made for less need to move around. Aztecs, Mayans, and Incas were major groups in the Americas. Southwest Pueblo, Navajo, Anasazi; peaceful corn farmers. Adobe made homes. Mississippi River Valley