Final answer:
The traditional land bridge believed to have connected Asia and North America during the Upper Paleolithic period is called Beringia. This route was used for migration by early humans, following megafauna, and is associated with the development of the Clovis culture in North America.
Step-by-step explanation:
The land bridge traditionally assumed to have been used by Upper Paleolithic peoples to reach North America from Asia is known as Beringia. During the peak stages of the last glaciation period, approximately eighteen thousand years ago, sea levels were much lower, thus connecting modern-day Alaska and Russia. Over time, as the glaciers melted and sea levels rose, Beringia became submerged beneath what is now the Bering Strait. Early humans likely followed the migration of megafauna such as mammoth and mastodons across this land bridge, gradually populating both North and South America. The Clovis culture is one of the notable societies believed to have descended from these first inhabitants, identified by distinctive stone tools found at archaeological sites in North America.