Baseball By Slimmer8120 Jun 20, 1791 The first mention of baseball. This is the first mention of baseball in the way we know it. Month and day not mentioned. Sep 23, 1845 The first game played with a set standard of rules. Period: Jun 20, 1865 to Jun 20, 1867 Number of baseball clubs increases drastically from 100 to about 400. Months not mentioned. Jun 20, 1871 First try at a major league baseball group. Jun 21, 1890 This time saw racial integration start back up. Jun 21, 1919 The white socks were involved in a scandal that rigged the world series game. Jun 20, 1920 During this time baseball became safer to play an recieved a new set of rules. Jun 21, 1939 The opening of the baseball hall of fame. Jun 21, 1958 New York was no longer the only place for national baseball. The Giants moved to california. Jun 21, 1969 Rules were changed to sway the favor from pitchers to batters.