Before Jackie Robinson broke the race barrier in 1947, baseball was split in between the 2 Major Leagues and the Negro League. There was one attempt at a league to go up versus the MLBs National and American leagues in the early 20th century: The Federal League. Glenn Beckert https://sergiolljfd.creacionblog.com/28393972/significant-league-baseball-should-broaden-its-usage-of-instant-replay-now