Jackie Robinson is credited with breaking MLB's color barrier in 1947. However, back in 1884 in the American Association, a major league at the time, Moses Walker and his brother Welday Walker played for the Toledo Blue Stockings. Moses was nicknamed Fleet and played 42 games as a catcher and batted .263. His brother Welday played 5 games as an outfielder and batted .222.
Jackie Robinson was the first African American MLB player