Millions of indigenous peoples inhabited the Americas prior to European contact, with over 500 distinct groups in North America alone speaking thousands of languages. While early interpretations portrayed Native Americans as primitive obstacles, modern historians understand they had complex civilizations with long histories. People first migrated from Asia over 13,000 years ago, establishing diverse hunter-gatherer and agricultural societies across North and Mesoamerica before major civilizations like the Incas and Mississippian peoples emerged.