1. The Battle of Perryville: On June 18, 1861, the Battle of Perryville took place in Perryville, Kentucky during the American Civil War. This battle was one of the bloodiest battles fought in Kentucky, with over 7,600 casualties. The Union army emerged victorious from the battle and prevented the Confederate army from advancing further into Kentucky.

2. Father's Day: In 1910, the first Father's Day celebration was held in Spokane, Washington. However, it wasn't until 1972 that Father's Day became an official national holiday in the United States. June 18th has been celebrated as Father's Day in the past, depending on the year.

3. Ali-Frazier Boxing Match: On June 18, 1971, boxing legends Muhammad Ali and Joe Frazier faced off in the "Fight of the Century" at Madison Square Garden in New York City. The fight was highly anticipated and ended in Frazier defeating Ali by unanimous decision, handing Ali his first professional loss.

4. University of Kentucky Founded: On June 18, 1865, the University of Kentucky (then known as the Agricultural and Mechanical College of Kentucky) was founded. Today, the university is a major public institution that is widely recognized for its academic and athletic programs.

5. Muhammed Ali’s birthday: The legendary boxer Muhammed Ali was born on January 17, 1942. However, he famously claimed that his birthday was on June 18th, since that was the day he defeated Sonny Liston in 1964 to become the heavyweight boxing champion of the world. Ali passed away in 2016, but his legacy as one of the greatest athletes of all time lives on.