Great Migration: The movement of millions of African Americans from the rural South to cities in the North and West between 1916 and 1970.
Trail of Tears: The forced relocation and removal of Native American tribes from their ancestral lands in the southeastern United States to designated Indian Territory west of the Mississippi River in the 1830s.
Transatlantic Slave Trade: The transportation of enslaved Africans across the Atlantic Ocean from Africa to the Americas between the 16th and 19th centuries.