African-American boxer Jack Johnson knocks out white boxer Jim Jeffries in a heavyweight boxing match, sparking race riots across the United States.

John Arthur Johnson (March 31, 1878 June 10, 1946), nicknamed the "Galveston Giant", was an American boxer who, at the height of the Jim Crow era, became the first African-American world heavyweight boxing champion (19081915). Widely regarded as one of the most influential boxers of all time, his 1910 fight against James J. Jeffries was dubbed the "fight of the century". According to filmmaker Ken Burns, "for more than thirteen years, Jack Johnson was the most famous and the most notorious African-American on Earth". Transcending boxing, he became part of the culture and history of racism in the United States.In 1912, Johnson opened a successful and luxurious "black and tan" (desegregated) restaurant and nightclub, which in part was run by his wife, a white woman. Major newspapers of the time soon claimed that Johnson was attacked by the government only after he became famous as a black man married to a white woman, and was linked to other white women. Johnson was arrested on charges of violating the Mann Actforbidding one to transport a woman across state lines for "immoral purposes"a racially motivated charge that embroiled him in controversy for his relationships, including marriages, with white women. Sentenced to a year in prison, Johnson fled the country and fought boxing matches abroad for seven years until 1920 when he served his sentence at the federal penitentiary at Leavenworth.

Johnson continued taking paying fights for many years, and operated several other businesses, including lucrative endorsement deals. He died in a car crash on June 10, 1946, at the age of 68. He is buried at Graceland Cemetery in Chicago. In 2005 , Johnson was formally pardoned by U.S. Senator John McCain.

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.