Connecting Alaska and siberia how many migrations where there?

The first humans arrived in North America from Siberia over 15,000 years ago during the last Ice Age. The most widespread migration across the Bering Strait occurred during the late Wisconsin glaciation, roughly between 25,000 and 13,000 years ago, when falling sea levels created the Bering Land Bridge. Archaeological evidence suggests there may have been at least three waves of migration during this period.