1. Wyoming became a state - April 20th, 1890 - On this day, Wyoming officially became the 44th state in the United States. The area had previously been a territory and its path to statehood was somewhat complicated due to a long-standing debate over whether it would be designated as a separate state or be combined with other neighboring territories.

2. First Atomic Energy Commission meeting held - April 20th, 1946 - The first Atomic Energy Commission meeting following the establishment of the commission took place on this day. The meeting marked the beginning of a new era in the development and use of nuclear energy.

3. Largest coal reserve found in the world - April 20th, 1978 - The largest coal reserve in the world, which contained over 1 trillion tons of coal, was discovered in the Powder River Basin in Wyoming on this day. This discovery had a significant impact on the region's economy and the development of the country's energy industry.

4. First African-American woman elected to Wyoming Senate - April 20th, 1989 - On this day, Alferdita "Dita" L. Moss, a Democratic politician and lawyer, made history when she became the first African-American woman to be elected to the Wyoming State Senate. She served three terms and played a significant role in the state's legislative history.

5. Wyoming Research and Education Network created - April 20th, 1990 - The Wyoming Research and Education Network (WREN) was officially created on this day as the state's primary provider of high-speed internet access for educational and research purposes. The network has since expanded and provides connectivity to schools, libraries, and other institutions across the state.