Final answer:
Paleolithic peoples arrived in North America by either crossing the Bering Land Bridge or through coastal migration from Asia.
Step-by-step explanation:
Scientific theories suggest that Paleolithic peoples arrived in North America through the Bering Land Bridge, which connected Asia and North America during the last ice age. As the ice melted, they migrated across North, Central, and South America, adapting their hunter-gatherer strategies to the environments and available resources.
Another theory known as the coastal migration theory suggests that some people arrived in the Americas by following the coast from Asia down to South America. This theory is supported by archaeological sites in South America that predate the Clovis sites in North America.
In conclusion, the most accepted theories propose that Paleolithic peoples arrived in North America by crossing the Bering Land Bridge or through coastal migration from Asia.