The correct answer is C. Choctaw.
1. The Choctaw people lived east of the Mississippi River and lost 23 million acres of land in the Treaty of Fort Jackson.
The Choctaw tribe was one of the Native American tribes that inhabited the southeastern United States. They were forced to cede a significant amount of their land in the Treaty of Fort Jackson in 1814, leading to the loss of millions of acres of their territory. This event had a profound impact on the Choctaw people and their way of life.