Martin Luther King Jr. Day is a federal holiday in the United States observed on the third Monday of January each year. King was chief spokesperson for nonviolent activism in the Civil Rights Movement, which protested racial discrimination in federal and state law and civil society. The movement led to several groundbreaking legislative reforms in the United States.

Martin Luther King Jr. was an American Christian minister, activist, and political philosopher who was one of the most prominent leaders in the civil rights movement from 1955 until his assassination in 1968. A black church leader and a son of early civil rights activist and minister Martin Luther King Sr., King advanced civil rights for people of color in the United States through the use of nonviolent resistance and nonviolent civil disobedience against Jim Crow laws and other forms of legalized discrimination.