1903 Iroquois Theater Fire happend.
In 1908 the Garfield Park Conservatory opened.
1909 saw saw Grant Park opened as "Forever Open, Clear and Free."
Comiskey Park opened a year later in 1910 which would be the home for the Chicago White Sox for many years to come.
1914 saw Wrigley Field open and the Chicago Cubs still play there today.
1917 and 1919 the Chicago White Sox won the World Series and two years later it was followed with the Black Sox scandal that led to many players being banned perminatly from playing professional baseball.
1919 also started the Race Riots in Chicago.
1925 had the opening of Solider Field where the Chicago Bears would now start to play after