Trail of Tears: The forced removals of Native American tribes from their ancestral lands in the southeastern United States to areas west of the Mississippi River during the 1830s.
Great Migration: The movement of millions of African Americans from rural Southern states to urban areas in Northern cities between approximately 1916 and 1970.
Dust Bowl Migration: The mass migration of farmers from the Great Plains region to other parts of the United States during the 1930s due to severe drought and soil erosion.