1. In 1833, the Chicago town council passed an ordinance that prohibited the slaughter of animals within the city limits, which helped to make way for the city's rapid growth and development.

2. In 1888, the first edition of the Chicago Tribune's Sunday comics section was published, which included the first appearance of the "Yellow Kid" cartoon character.

3. In 1918, the Great Lakes Naval Station held a military funeral service for Ensign George Morton, who died in a crash while testing a seaplane.

4. In 1949, the USS Illinois submarine was launched from the Electric Boat Company shipyard in Groton, Connecticut, becoming the first submarine to be named after the state of Illinois.

5. In 2004, the Illinois Supreme Court ruled that the state's law banning same-sex marriage was unconstitutional, paving the way for legal recognition of same-sex marriage in the state.