The reservation is rich with history but much of it has been bloody. At the 1890 Wounded Knee Massacre, U.S. troops were sent to contain the Ghost Dance movement -- a ritual tied to a prophecy predicting an end to white American expansion. Some estimate more than 300 Native Americans were killed. In the photo above, bodies of Sioux Indians are piled into a mass grave hacked into the frozen soil. (MPI/Getty Images)