African Americans (also referred to as Black Americans and formerly Afro-Americans) are an ethnic group consisting of Americans with partial or total ancestry from any of the black racial groups of Africa. The term "African American" generally denotes descendants of enslaved Africans who are from the United States. While some Black immigrants or their children may also come to identify as African-American, the majority of first generation immigrants do not, preferring to identify with their nation of origin.African Americans constitute the second largest racial group in the U.S. after White Americans, as well as the third largest ethnic group after Hispanic and Latino Americans. Most African Americans are descendants of enslaved people within the boundaries of the present United States. On average, African Americans are of West/Central African with some European descent; some also have Native American and other ancestry.According to U.S. Census Bureau data, African immigrants generally do not self-identify as African American. The overwhelming majority of African immigrants identify instead with their own respective ethnicities (~95%). Immigrants from some Caribbean and Latin American nations and their descendants may or may not also self-identify with the term.African-American history began in the 16th century, with Africans from West Africa being sold to European slave traders and transported across the Atlantic to the Thirteen Colonies. After arriving in the Americas, they were sold as slaves to European colonists and put to work on plantations, particularly in the southern colonies. A few were able to achieve freedom through manumission or escape and founded independent communities before and during the American Revolution.

After the United States was founded in 1783, most Black people continued to be enslaved, being most concentrated in the American South, with four million enslaved only liberated during and at the end of the Civil War in 1865. During Reconstruction, they gained citizenship and the right to vote, but due to White supremacy, they were largely treated as second-class citizens and found themselves soon disenfranchised in the South. These circumstances changed due to participation in the military conflicts of the United States, substantial migration out of the South, the elimination of legal racial segregation, and the civil rights movement which sought political and social freedom. In 2008, Barack Obama became the first African American to be elected President of the United States.