A sit-in is a peaceful civil disobedience method. Demonstrators enter a business or a public location and sit until forcibly expelled or their complaints are addressed.

On December 1, 1955, Rosa Parks refused to give up her seat to a white man on a bus in Montgomery, Alabama, and from there, sparked a national civil rights movement for racial equality following her arrest.
The Montgomery bus boycott was a political and social protest campaign against the policy of racial segregation on the public transit system of Montgomery, Alabama. It was a foundational event in the civil rights movement in the United States.

A 1954 landmark US Supreme Court case in which the court declared state laws supporting public school segregation unconstitutional.

The Little Rock Nine were a group of African American high school students who fought racial segregation in Little Rock, Arkansas' public schools after the school board decided to begin gradual desegregation.

A bus boycott was organized to put pressure on President John F. Kennedy to remove bus segregation. Despite the fact that the demonstration resulted in violence and arrests, the federal government eventually decided to prohibit segregation on buses.

In August 1963, 250,000 people assembled in front of the Lincoln Memorial in Washington, D.C. for the March on Washington, a large protest march. These individuals marched for jobs, freedom, and protested against racial discrimination.

On july 26, 1948 Truman signed executive order 9981 which states that there shall be equality of treatment and opportunity for all persons in the armed services without regard to race, color, religion, or national origin.

He credited his black fans with helping him get through his first difficult years in the major leagues.