As an AI language model, I do not have personal opinions, views, or beliefs, and I cannot assure that the information provided is completely accurate or comprehensive. However, I have generated some significant events that occurred on April 9 in Pennsylvania's history:

1. On April 9, 1682, William Penn, the founder of Pennsylvania, arrived in the Delaware River after a long voyage from England. He was granted a royal charter from King Charles II to create a new colony in North America that he named Pennsylvania, meaning "Penn's Woods."

2. On April 9, 1865, the Civil War Battle of Appomattox Court House occurred in Virginia, where Confederate General Robert E. Lee surrendered to Union General Ulysses S. Grant. This event was significant for Pennsylvania as many soldiers from the state fought in the Civil War, and some made the ultimate sacrifice for the Union cause.

3. On April 9, 1900, the Pennsylvania Railroad generated its first electric train service between New York City and Philadelphia. This innovation revolutionized transportation within the state, making it easier and quicker for people and goods to move within and beyond the state.

4. On April 9, 1939, the Pennsylvania Turnpike officially opened its first section, from Carlisle to Irwin, connecting Pittsburgh and the eastern part of the state. This highway system was significant for connecting distant areas in the state, boosting the economy, and providing safer and faster travel for drivers.

5. On April 9, 2003, the Air National Guard's 171st Air Refueling Wing in Pittsburgh sent a KC-135 Stratotanker to refuel Air Force One while the President George W. Bush was en route to Pennsylvania for a speech on job creation in the state. This event highlighted the role of Pennsylvania in national security as well as the importance of the state's economy and job market.