1. The Battle of Germantown was fought on December 6, 1777, during the American Revolutionary War. General George Washington and his Continental Army attacked British forces led by General William Howe in an attempt to retake Philadelphia. Although the battle was ultimately a British victory, it demonstrated the strength and determination of the American forces.

2. On December 6, 1865, the 13th Amendment to the United States Constitution was ratified by Pennsylvania, becoming the first state to officially abolish slavery. The amendment was later adopted by the rest of the states and became a seminal moment in American history.

3. The first U.S. coin minted outside of the original 13 colonies was produced on December 6, 1792, at the U.S. Mint in Philadelphia. The mint, which still operates today, produces billions of coins each year for circulation and collecting.

4. Philadelphia was the site of the first national meeting of the Boy Scouts of America on December 6, 1915. The organization, which celebrates its 106th anniversary this year, has been an important part of American youth culture for generations.

5. On December 6, 1957, the Pennsylvania Turnpike officially opened the world's longest tunnel at the time, the Allegheny Mountain Tunnel. The tunnel stretches for just over a mile and helped to make travel across the state faster and more efficient. Today, the Pennsylvania Turnpike is one of the busiest highways in the United States.