Final answer:
Dr. Martin Luther King, Jr. was an agent of historical change through his leadership in the African American Civil Rights Movement and his efforts to combat injustice. He inspired and mobilized African Americans to fight for their rights, resulting in significant changes in legislation.
Step-by-step explanation:
Dr. Martin Luther King, Jr. was an agent of historical change because of his leadership in the African American Civil Rights Movement. He used his public speaking abilities and magnetism to inspire African Americans to stand up against injustice in an extremely hostile environment. His work led to sweeping changes in civil rights legislation, including the Civil Rights Act of 1964 and the Voting Rights Act of 1965.