The indigenous Choctaw Indians occupied the Delta region for hundreds of years prior to the arrival of European settlers, with ancestors stretching thousands of years into the past. The first removal treaty carried out under the Indian Removal Act was the 1830 Treaty of Dancing Rabbit Creek, by which the Choctaw ceded about 11 million acres of the Choctaw Nation (now Mississippi) to the United States in exchange for about 15 million acres in Indian Territory (now Oklahoma).