<human>:  When did the first humans arrive in the Americas?
<bot>: The first humans arrived in the Americas between 15,000 and 20,000 years ago. Humans probably arrived in the Americas by crossing the Bering land bridge, which connected Siberia to Alaska. Humans have been living in the Americas for thousands of years, but the first humans who arrived in the Americas are not the same people who are still living there today.