1. Birth of Grace Kelly: On November 12, 1929, Grace Kelly was born in Philadelphia, Pennsylvania. Kelly went on to become a renowned Hollywood actress, starring in iconic films such as "Rear Window" and "High Society," before marrying Prince Rainier III of Monaco.

2. Signing of the Treaty of Fort Pitt: On November 12, 1778, a group of American Indian leaders signed the Treaty of Fort Pitt with the United States. The treaty ended the Revolutionary War's western frontier conflicts and established a boundary between American settlements and Indian lands.

3. The First Mummer's Parade: On January 1, 1901, the first official Mummer's Parade occurred in Philadelphia. However, the tradition began on November 12, 1698, when Swedish settlers in Philadelphia formed the first Mummers' club.

4. The Allegheny County Courthouse: The Allegheny County Courthouse in Pittsburgh, Pennsylvania, opened on November 12, 1888. The courthouse is renowned for its grand architecture and has been listed on the National Register of Historic Places.

5. The first steamboat in North America: On November 12, 1787, John Fitch successfully tested the first successful steamboat in North America. The steamboat, which was 45-feet-long and used 12 oars for additional propulsion, traveled on the Delaware River for over 25 miles at a speed of 6 miles per hour.