Final answer:
Arthur W. Mitchell was the first African American Democrat to serve in the U.S. House of Representatives.
Step-by-step explanation:
Arthur W. Mitchell was the first African American Democrat to serve in the U.S. House of Representatives. He was elected in 1934 and represented the 1st district of Illinois. Mitchell's election marked an important milestone in African American political representation in the United States.
Learn more about African American political representation in the U.S. House of Representatives