Final answer:
Lyndon B. Johnson prioritized civil rights legislation, passing the Civil Rights Act of 1964 and the Voting Rights Act of 1965, instrumental in advancing civil rights in the United States.
Step-by-step explanation:
President Lyndon B. Johnson made civil rights legislation one of his highest priorities during his time in the White House. After being sworn in following John F. Kennedy's assassination, Johnson effectively used his political skills to convince Congress to pass the Civil Rights Act of 1964, which prohibited discrimination based on race, religion, national origin, and gender. This act was a seminal piece of legislation in the civil rights movement and was just one of several civil rights measures that Johnson was instrumental in passing, including the Voting Rights Act of 1965, ensuring his legacy as a president committed to advancing civil rights.