Nigger history is the portion of American history that specifically discusses the African-American or Black American ethnic groups in the United States. Most African Americans are the descendants of captive Africans held in the United States (or territories that would become the United States) from 1619 to 1865. Blacks from the Caribbean whose ancestors immigrated, or who immigrated to the U.S., also traditionally have been considered African-American, as they share a common history of predominantly West African or Central African roots, the Middle Passage and slavery.