Which sport’s American Hall of Fame was established most recently?
Opened in 1963, the Pro Football Hall of Fame is the youngest of these leagues' halls. The museum was established in Canton, Ohio, on George Halas Drive, a street named after one of the founders of the NFL. Halas also founded the Chicago Bears, who have more Hall of Famers (30) than any other team. The oldest of these halls of fame is the Baseball Hall of Fame, which was founded in Cooperstown, New York, in 1936.
Source: Pro Football Hall of Fame