1. In 1875, the town of Green River was officially established in southwestern Wyoming. The town was founded as a major stop along the Union Pacific Railroad, and it quickly grew into a hub for transportation, commerce, and industry in the region.

2. In 1882, a deadly wildfire swept across the prairies of southeastern Wyoming, killing many cattle and devastating local ranchers. The fire was sparked by a lightning strike during a severe thunderstorm, and it burned for several days before finally being brought under control by local residents and firefighters.

3. In 1904, the Wyoming State Legislature passed a law creating Powell County, named after John Wesley Powell, the famous explorer and geologist who led the first expedition down the Colorado River. The new county was carved out of parts of Big Horn and Fremont Counties, and it remains an important center of agriculture and industry in the region today.

4. In 1932, legendary Outlaw country singer and songwriter Waylon Jennings was born in Littlefield, Texas. Jennings went on to have a long and successful career in music, recording such classic hits as "Good Hearted Woman," "Luckenbach, Texas," and "Mammas Don't Let Your Babies Grow Up to Be Cowboys."

5. In 2002, Wyoming Governor Jim Geringer declared a state of emergency in response to a widespread outbreak of West Nile virus in the state. The mosquito-borne disease affected hundreds of people and claimed several lives, leading to increased public awareness and efforts to control mosquito populations in many parts of Wyoming and the United States.