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William Hulbert created the National League to replace the National Association. This changed everything about the game because they brought it to a professional level.
http://www.history.com/this-day-in-history/national-league-of-baseball-is-founded -
It was created so african americans could also play baseball. This changed baseball because it expanded its audience and made it more popular.
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When the this league was created, it made a big change in baseball, the teams in the National League became rivals with the teams in the American League making the games a lot more competitive.
http://www.baseballlibrary.com/chronology/rules2.php -
This changed baseball because it created a league that baseball players could play in to get better so they could go to the major leagues.
http://www.milb.com/milb/history/timeline.jsp -
On this day, it was the first time people could listen to the games on the radio, rather than having to buy a ticket to go to the game. This made baseball more popular around the country.
http://www.baseballlibrary.com/chronology/rules2.php -
Someone had the idea to have an all star game at the same time as the World's Fair. It changed baseball because it wa so popular that it became a yearly thing.
http://www.baseballlibrary.com/chronology/byyear.php?year=1933#January -
A game was delayed because of rain, so they had to play at night. This was a very big change because teams were struggling getting people to day games because they had to work, and since they started to play at night more people were able to go to the games.
http://www.thepeoplehistory.com/baseballhistory.html -
Five players were voted into the hall of fame. I think this changed baseball because they made something that would remember all of the great players that played in the past.
http://www.baseballlibrary.com/chronology/byyear.php?year=1936#January -
Jackie Robinson became the first african american to play in the MLB. This changed a lot of things, like more african americans came and played in the major leagues.
http://www.baseballlibrary.com/chronology/byyear.php?year=1947#April -
The American League adopted the designated rule but the National League decided not to. This changed baseball because the two leagues had different rules so whenever teams from the two leagues played eachother they would have to decide whos rules to play by.
http://www.history.com/this-day-in-history/american-league-adopts-designated-hitter-rule
