Throughout baseball history, there have been a number of groundbreaking occasions. America's pastime has undergone a number of changes throughout the years that have made the game that we love great.
Some of these groundbreaking moments had to do with changing the game was played. Others changed the way that players were able to move throughout the league.
Each of these moments has had a significant impact on the game of baseball. Groundbreaking moments like the ones that will be mentioned here have helped baseball remain popular throughout the years.
Events are listed in chronological order.