Trail of Tears:The forced relocation and movement of Native American nations from southeastern parts of the United States following the Indian Removal Act of 1830. Thousands of Native Americans were made to walk westward to designated 'Indian territory', leading to the deaths of an estimated 4,000 Native Americans.
Indian Appropriations Act: A series of acts passed by the United States Congress in the 1850s that provided funding for the implementation of the Indian Removal Act, including the forced relocation of Native American tribes to designated 'Indian territory' west of the Mississippi River.
Tribal Sovereignty:The inherent authority of indigenous tribes to govern themselves within the borders of the United States. The Indian Removal Act challenged tribal sovereignty by forcibly relocating Native American tribes from their ancestral homelands.