Answer: The migration across the Bering Strait occurred around 15,000 to 20,000 years ago, and it is believed to have been the primary route for the peopling of the Americas. These early settlers gradually spread across the continent, eventually giving rise to the diverse indigenous cultures and civilizations that inhabited the Americas before the arrival of Europeans. The correct answer is 4. Bering Strait.
Step-by-step explanation
When prehistoric people first came to America, they crossed over a "land bridge" that connected Asia and North America. This land bridge, known as Beringia, was located in the present-day Bering Strait between Siberia (Asia) and Alaska (North America).
During the last Ice Age, sea levels dropped, exposing a land connection between the two continents. This allowed early humans to migrate from Asia to North America by crossing the Bering Strait on foot or using simple watercraft. The Bering Strait is a narrow passage of water, approximately 50 miles wide, that separates the two landmasses.