1. On December 19, 1890, Chief Big Foot and his band of Miniconjou Lakota were massacred at Wounded Knee Creek in South Dakota. Many of the victims were originally from Wyoming and had been forced to relocate from their traditional lands to reservations.

2. In 1907, the first automobile arrived in Lander, Wyoming on December 19. It was owned by a local businessman named Herman Osterlund and caused quite a stir among the townspeople.

3. December 19, 1917 marked the founding of the Wyoming State Hospital in Evanston, which was originally known as the Wyoming State Insane Asylum. The facility was intended to provide care for mentally ill patients in the state.

4. In 1968, the Wyoming Highway Patrol began using radar to enforce speed limits on December 19. This technology allowed officers to track the speed of passing vehicles and issue tickets to those who were breaking the law.

5. On December 19, 1989, the Teapot Dome Scandal was memorialized as a national historic site in Wyoming. The scandal involved bribery and corruption during the administration of President Warren G. Harding and occurred at a Naval Petroleum Reserve located near Teapot Dome, Wyoming.