Harry S. Truman, John F. Kennedy, and Lyndon B. Johnson.
Explanation:
These are the presidents that are most closely associated with advancements in the Civil Rights Movement. Truman submitted the first comprehensive civil rights legislation. He was also significant for starting integration in the military and federal agencies. In the case of Kennedy, he proposed the Civil Rights Act before his assassination. However, this was not passed until the presidency of Lyndon B. Johnson, who signed it into law in 1964.
