Final answer:
Beringia is the land bridge that modern humans used to migrate to the Americas. This occurred during the last glaciation period when sea levels were much lower, and it is the most accepted theory supported by genetic studies linking Native Americans and Asian populations.
Step-by-step explanation:
The name of the land bridge used by modern humans to migrate to America is called Beringia. Approximately between 20,000 to 14,000 years before present (BP), during the peak stage of the last glaciation period, Beringia connected northeast Siberia to what is now Alaska. This occurred when global sea levels were significantly lower due to the formation of glacial ice. The first Homo sapiens are believed to have crossed into North America in pursuit of large mammals, such as mammoth and mastodon, eventually populating both North and South America and forming diverse cultures and civilizations. The existence of Beringia as a migration route has been supported by genetic studies showing links between Native Americans and Asian populations. In contrast, the Solutrean hypothesis, suggesting European ancestry, is widely doubted due to a lack of supportive genetic evidence.