1. 1876: Colorado is admitted to the United States as a state

On May 20, 1876, Colorado officially became the 38th state in the United States of America. Prior to becoming a state, Colorado was a territory of the United States for 10 years.

2. 1996: Blizzard hits Denver, Colorado

On May 20, 1996, a blizzard hit Denver, Colorado, and surrounding areas, with snowfall reaching up to 14 inches. The storm caused many businesses and schools to close, and there were several accidents due to the slippery conditions.

3. 1932: Amelia Earhart flies from Los Angeles to Denver

On May 20, 1932, the famed aviator Amelia Earhart made a historic flight from Los Angeles to Denver. Earhart was the first woman to make the flight, which covered 1,500 miles and took 19 hours and 5 minutes.

4. 2005: Xcel Energy announces plan to build wind farm

On May 20, 2005, Xcel Energy announced its plans to build a wind farm in Prowers County, Colorado. The wind farm would eventually become the largest in Colorado and one of the largest in the United States.

5. 2013: Colorado becomes the first state to legalize marijuana

On May 20, 2013, Colorado became the first state in the United States to legalize the recreational use of marijuana. This landmark decision paved the way for other states to follow suit, with many now having laws allowing the use of marijuana for medicinal or recreational purposes.