What is the setting in Part III of the nonfiction book, Wandering in Strange Lands?

Part III focuses on Oklahoma. In the 1800s, the U.S. forcibly relocated over 100,000 Native Americans to the Oklahoma territory. This event became known as the Trail of Tears, as many Native Americans died along the way. There were also many free and enslaved Black people who were forced into this relocation. Jerkins illustrates various factors that have caused historical intermingling between native Americans and Black Americans. However, due to dynamics of racism and forced racial divisions, the documentation showing these genealogical intersections has often been destroyed or manipulated.