As an AI language model, I do not have any disclaimers to put before my responses. Here are five interesting facts about January 1 in Illinois history:

1. On January 1, 1818, Illinois became the 21st state to join the United States. The first Governor of Illinois, Shadrach Bond, was sworn in on this day and the state's capital was located in Kaskaskia.

2. The first Rose Bowl game was played on January 1, 1902, in Pasadena, California. The game featured the University of Michigan against Stanford University, but the University of Illinois had been invited to participate, and declined the offer in favor of playing in the Western Conference championship game.

3. On January 1, 1927, the first Municipal Airport opened in Chicago. It was later renamed Midway Airport in honor of the Battle of Midway during World War II.

4. Illinois' first African American Congressman, Adam Clayton Powell Jr., was sworn in on January 1, 1945. Powell served in the House of Representatives until his death in 1972, and was known for his work in civil rights and education.

5. On January 1, 2014, same-sex marriage became legal in Illinois. The state had previously passed a civil union law in 2011, but on this day same-sex couples gained the right to legally marry in the state.