The first humans likely inhabited North America around 15,000 to 20,000 years ago, although exact dates are still debated among scientists. These early inhabitants are believed to have migrated from Asia across the Bering Land Bridge, which connected Siberia to Alaska during the last Ice Age. Archaeological findings, including tools and ancient campsites, have provided evidence of these early hunter-gatherer societies. Over time, these groups adapted to diverse environments, leading to varied cultures across the continent. This early settlement laid the groundwork for the complex civilizations and tribes that would develop over millennia within North America.