Emmett Louis Till (July 25, 1941 August 28, 1955) was a 14-year-old African American boy who was abducted, tortured, and lynched in Mississippi in 1955, after being accused of offending a white woman, Carolyn Bryant, in her family's grocery store. The brutality of his murder and the fact that his killers were acquitted drew attention to the long history of violent persecution of African Americans in the United States. Till posthumously became an icon of the civil rights movement.Till was born and raised in Chicago, Illinois. During summer vacation in August 1955, he was visiting relatives near Money, Mississippi, in the Mississippi Delta region. He spoke to 21-year-old Carolyn Bryant, the white, married proprietor of a small grocery store there. Although what happened at the store is a matter of dispute, Till was accused of flirting with, touching, or whistling at Bryant. Till's interaction with Bryant, perhaps unwittingly, violated the unwritten code of behavior for a black male interacting with a white female in the Jim Crow-era South. Several nights after the incident in the store, Bryant's husband, Roy, and his half-brother J.W. Milam, who were armed, went to Till's great-uncle's house and abducted Emmett. They took him away then beat and mutilated him before shooting him in the head and sinking his body in the Tallahatchie River. Three days later, the boys mutilated and bloated body was discovered and retrieved from the river.

Till's body was returned to Chicago where his mother insisted on a public funeral service with an open casket, which was held at Roberts Temple Church of God in Christ. It was later said that "The open-coffin funeral held by Mamie Till Bradley exposed the world to more than her son Emmett Till's bloated, mutilated body. Her decision focused attention on not only U.S. racism and the barbarism of lynching but also the limitations and vulnerabilities of American democracy". Tens of thousands attended his funeral or viewed his open casket, and images of his mutilated body were published in black-oriented magazines and newspapers, rallying popular black support and white sympathy across the U.S. Intense scrutiny was brought to bear on the lack of black civil rights in Mississippi, with newspapers around the U.S. critical of the state. Although local newspapers and law enforcement officials initially decried the violence against Till and called for justice, they responded to national criticism by defending Mississippians, temporarily giving support to the killers.

In September 1955, an all-white jury found Bryant and Milam not guilty of Till's murder. Protected against double jeopardy, the two men publicly admitted in a 1956 interview with Look magazine that they had tortured and murdered the boy, selling the story of how they did it for $4,000. Till's murder was seen as a catalyst for the next phase of the civil rights movement. In December 1955, the Montgomery bus boycott began in Alabama and lasted more than a year, resulting eventually in a U.S. Supreme Court ruling that segregated buses were unconstitutional. According to historians, events surrounding Till's life and death continue to resonate. An Emmett Till Memorial Commission was established in the early 21st century. The Sumner County Courthouse was restored and includes the Emmett Till Interpretive Center. Fifty-one sites in the Mississippi Delta are memorialized as associated with Till. The Emmett Till Antilynching Act, an American law which makes lynching a federal hate crime, was signed into law on March 29, 2022 by President Joe Biden.

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.