1. The first official Wyoming State Fair was held on August 4, 1905, in Douglas, Wyoming. The fair was established to promote agriculture and livestock production in the state and serves as an annual celebration of Wyoming's culture and heritage.

2. On August 4, 1951, the Ames Monument was dedicated near Laramie, Wyoming. The monument commemorates brothers Oakes and Oliver Ames, who financed the construction of the Union Pacific Railroad. The monument stands at the highest point of the railroad's route and is a popular tourist attraction for visitors to Wyoming.

3. August 4, 1945, marks the day that Wyoming Senator Joseph C. O'Mahoney was one of just two Senators to vote against the establishment of the United Nations. O'Mahoney opposed the international organization because he felt that it represented a compromise of American sovereignty.

4. Wyoming's first State Capitol Building was dedicated on August 4, 1887, in Cheyenne, Wyoming. The building served as the seat of government for the state until 1917 when a new Capitol Building was constructed. The old Capitol Building now serves as the Wyoming Supreme Court Building.

5. August 4, 1920, was the day that Warren Pershing, son of General John J. Pershing, was born in Sheridan, Wyoming. Warren Pershing went on to a distinguished military career, serving in the Air Force during World War II and later as a professor at the Air Force Academy. He was awarded numerous medals and commendations for his service.