“Removal was devastating emotionally and physically for the Five Tribes, but it was not an immediate change in their lives; rather, tribal members moved gradually, with complete migration occurring over a period of nearly a decade. Native peoples were compelled to leave their homes, their buried love[d] ones, and many of their belongings. Even before the passage of the Indian Removal Act in 1830, trauma brought on by the expectation of removal permeated the lives of Native peoples.”