As an AI language model, I do not have personal opinions, preferences, or beliefs. However, here are five interesting facts about September 12 in Illinois history:

1. On September 12, 1818, Illinois became the 21st state to enter the Union. The state's name derived from the native Illiniwek tribe, which means "men" or "people."

2. In 1862, the Union Army of the Potomac fought the Battle of Harpers Ferry during the American Civil War. The battle resulted in a Union victory and the capture of over 12,000 Confederate soldiers. Illinois soldiers played a significant role in this battle.

3. On September 12, 1938, the office of Illinois Governor was held by Henry Horner, who was the first Jewish governor of Illinois and the first foreign-born Jew to lead an American state. He served from 1933 until his death in 1940.

4. Famous comedian, actress, and author Amy Poehler was born in Burlington, Massachusetts, on September 12, 1971. Poehler had a recurring role as a host in the comedy television show "Saturday Night Live" and was a co-founder of the Upright Citizens Brigade Theatre.

5. On September 12, 2001, the day after the 9/11 attacks on the World Trade Center and the Pentagon, a memorial service was held at the McCormick Place Auditorium in Chicago. Thousands of people gathered to mourn and pay tribute to the victims, including 176 Illinois residents who lost their lives in the attacks.