The first humans are thought to have settled in the Americas around 20,000 years ago.
They likely crossed from Asia into North America via Beringia, a land bridge that connected Siberia to Alaska.
By 8,000 BCE, human settlements are thought to have spread across what is now the United States.
Striking artefacts from this period include a pair of sandals found in Oregon and a painted bison skull in Oklahoma.
In California, the oldest human remains date from 11,000 BCE.
Humans at the time were highly mobile, hunting large game such as mammoths and bison.
They traveled in small groups of 20-50 people, tracking game and following fresh water sources.
However, by 7,000 BCE, global warming and overhunting led to the extinction of many large animals.
As a result, people shifted to hunting smaller game like rabbits, deer, and antelope, and supplemented their diet with nuts, seeds, fruits, and fish.
In the Southwest of the U.S., three major archaeological cultures emerged: the Ancestral Pueblo, the Hohokam, and the Mogollon.
Some of their remarkable sites, such as Chaco Canyon and Mesa Verde, are still visible today and are recognized as UNESCO World Heritage Sites.
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