1. In 1820, the Pennsylvania House of Representatives voted to expel Representative George Kremer for his involvement in a dispute over the presidential election of 1824. Kremer accused Secretary of State John Quincy Adams of making a "corrupt bargain" with Henry Clay to win the election. His expulsion marked the first time a member had been expelled from the House of Representatives for words spoken on the floor.

2. On February 20, 1864, Union forces under General William T. Sherman launched a surprise attack on Confederate forces at the Battle of Olustee in Florida. The battle ended in a Confederate victory, but it was one of the bloodiest battles of the Civil War and marked the farthest advance of Union forces into Florida.

3. In 1884, the Pennsylvania Railroad completed construction of its Altoona Works, one of the largest railroad repair shops in the world. The facility employed over 15,000 workers at its peak and played a critical role in the development of the American railroad industry.

4. On February 20, 1933, the state of Pennsylvania ratified the 21st Amendment, which repealed prohibition and legalized the sale and consumption of alcohol in the United States. Pennsylvania was the 34th state to ratify the amendment, providing the necessary three-fourths majority needed for its passage.

5. In 1962, astronaut John Glenn became the first American to orbit the earth aboard the spacecraft Friendship 7. Glenn, who was born in Ohio but spent much of his life in Pennsylvania, orbited the earth three times before safely splashing down into the Atlantic Ocean. His successful mission marked a significant milestone in the early days of the space race.