1. In 1778, British forces attacked Wyoming Valley in Pennsylvania during the American Revolutionary War, resulting in one of the worst massacres in American history known as the Battle of Wyoming. It is estimated that approximately 300 American soldiers and settlers were killed.

2. On June 18, 1812, the United States declared war on Great Britain, starting the War of 1812. Pennsylvania played a crucial role in providing troops and supplies for the war effort.

3. The Gettysburg Address was delivered by President Abraham Lincoln on November 19, 1863, but the groundwork for the famous speech was laid on June 18, 1863, when Lincoln visited the battlefield and gave a private tour to his secretary, John Nicolay.

4. In 1934, the first roller coaster designed with a tubular steel track, the "Flying Turns," opened at Pennsylvanian amusement park, Hersheypark. The ride was created by the park's founder, Milton S. Hershey.

5. On June 18, 1999, the Allegheny County Court of Common Pleas ruled in favor of the African American plaintiffs in the landmark case, "Gaskins v. Commonwealth of Pennsylvania," which challenged the constitutionality of the state's educational funding system. This decision helped to increase funding for schools in underserved areas, particularly those with high numbers of minority and low-income students.