1. Territorial status achieved on April 1, 1869: On April 1st, 1869, the Wyoming Territory was established by the United States Congress. This made Wyoming the first state in the United States to grant women the right to vote in 1869, nearly 50 years before the 19th Amendment was ratified.

2. Wyoming coal boom began on April 1, 1890: On April 1st, 1890, the first commercial coal mine in Wyoming opened in Carbon, Wyoming. This marked the beginning of the coal mining industry in Wyoming, which grew to become the largest in the United States and was a significant contributor to the state's economy for over a century.

3. Devils Tower designated as the first national monument on April 1, 1906: On April 1st, 1906, President Theodore Roosevelt designated Devils Tower as the first national monument in the United States. Devils Tower, located in northeastern Wyoming, is a significant geological formation and is sacred to several Native American tribes.

4. First Wyoming Governor's Mansion opened on April 1, 1905: On April 1st, 1905, the first Wyoming Governor's Mansion opened in Cheyenne, Wyoming. The mansion has since been restored and is now available for tours and events.

5. First Wyoming State Capitol cornerstone laid on April 1, 1887: On April 1st, 1887, the cornerstone for the first Wyoming State Capitol was laid in Cheyenne, Wyoming. The building was completed in 1890 and served as the state capitol until the current capitol building was constructed in the early 20th century.