1. Current scientific evidence suggests that people arrived in America when? (native people not Europeans)

The correct answer to this open question is the following.

Current scientific evidence suggests that people arrived in America when the Berin Strait was frozen, approximately 25,000 to 30, 000 years ago.

The Berin Strait is located in the Northern part of the North American continent and the Asian continent. Historians and anthropologists agree on the idea that in that time, the sea was frozen by the extremely cold temperatures and that is when people from Asia that were following animal herds to hunt and feed their families, crossed the Berin Strait from Russia to Alaska. Other scientists name this place as Beringia.

d: social contract theory