1. The Battle of Brandywine: On December 7, 1777, the Battle of White Marsh, also known as the Battle of Edge Hill or the Battle of Germantown Roads, happened near Philadelphia during the American Revolutionary War. The battle was fought between American Continental Army forces and British Army troops under the command of Major General Sir William Howe.

2. Trenton's First Return to Pennsylvania: On December 7, 1776, George Washington and his Continental Army won a critical victory against the Hessians at Trenton, New Jersey. After the victory, the army returned to Pennsylvania, where they were cheered by residents and hailed as heroes.

3. Pennsylvania's State Tree: On December 7, 1931, the Pennsylvania State Tree, the Eastern Hemlock, was officially adopted by the state. These trees are common in Pennsylvania's forests, and are known for their dense foliage, which provides shelter for a variety of wildlife.

4. Grand Opening of the Philadelphia Museum of Art: On December 7, 1928, the Philadelphia Museum of Art opened its doors to the public for the first time. The museum, which is famous for its impressive collection of American art, Asian art, and European art, quickly became one of the most popular tourist destinations in the city.

5. The Western Pennsylvanian Wilds: On December 7, 1993, the Pennsylvania state legislature passed a law creating the Pennsylvania Wilds, a 12-county region located in the northern and western parts of the state. The region, which covers more than two million acres of protected lands, offers visitors the opportunity to explore some of the state's most beautiful and rugged wilderness areas.