1. The Battle of Whitemarsh occurred on December 27, 1777, during the American Revolutionary War. It was a significant battle that ended in a stalemate, but it marked the Continental Army's ability to hold their ground against a larger force of British troops.

2. On December 27, 1814, Lancaster, Pennsylvania, experienced its coldest day on record, with temperatures dropping to -21 degrees Fahrenheit. This extreme weather caused severe damage to crops, livestock, and homes.

3. December 27, 1831, marked the opening of the Pennsylvania Main Line Canal, which connected Philadelphia to Pittsburgh via a network of canals and railroad systems. The canal played a significant role in the state's economic growth during the mid-19th century.

4. On December 27, 1945, the famous racing horse, Phalanx, was born in Chester County, Pennsylvania. Phalanx went on to win several important races, including the Belmont Stakes, and set a track record at Saratoga Race Course.

5. The Pennsylvania Transportation Company, which operated the first regularly scheduled bus service in the United States, was founded on December 27, 1902. The company's first route ran from downtown Bradford to the nearby town of Smethport. This innovative transportation system set the standard for bus travel in the United States.