1. The Battle of Trenton: On December 26, 1776, General George Washington and his Continental Army launched an attack on the Hessian garrison in Trenton, New Jersey. The successful battle proved to be a much-needed morale boost for the American troops.

2. The Great Blizzard of 1860: On December 26, 1860, a major snowstorm hit the northeastern United States, including Pennsylvania. The storm, known as the Great Blizzard of 1860, brought widespread disruption to the region and led to significant damage and loss of life.

3. The Great Anthracite Coal Strike: On December 26, 1902, anthracite coal miners in Pennsylvania went on strike, demanding better wages, working conditions, and hours. The strike lasted until October of the following year and led to significant social and economic upheaval in the region.

4. The Downingtown Industrial Exposition of 1870: On December 26, 1870, the Downingtown Industrial Exposition opened in Pennsylvania, showcasing the latest technological advancements in agriculture and industry. The exposition attracted visitors from across the state and helped to promote Pennsylvania's growing economy.

5. The First Public Zoo: On December 26, 1874, the Philadelphia Zoo opened to the public, becoming the first public zoo in the United States. Today, the zoo is home to over 1,300 animals representing more than 40 species, and remains a popular attraction for visitors to Pennsylvania.