Billy Caldwell, Alexander Robinson and the Treaty of Chicago (1833)

Two mixed race Ulster-Scots & Native Americans: Billy Caldwell (1782–1841) had an Ulster father and a Powatomi mother, and was known as Sauganash. Alexander Robinson (dates uncertain) also had an Ulster father and a Native American mother, joined the Powatomi tribe and was known as Che-che-pin-qua (‘Blinking Eyes’). They were both fur traders, and became the principal negotiators in the ceding of the last Native American lands in Illinois to the United States Government in 1833, known as the Treaty of Chicago. 

• A fuller story is available in this article and also in this one