1) In 1917, Montana passed the Montana Hemp Act, allowing for hemp cultivation for the production of fiber, cloth, and other materials. This was a significant step in the state's agricultural development.

2) On June 9, 1922, the famous Yellowstone earthquake occurred, which measured a 7.8 on the Richter scale and caused widespread damage throughout western Montana.

3) The first ever commercial flight in Montana was on June 9, 1928, when an airplane from the Boeing Air Transport company took off from Helena to Butte.

4) In 1953, the Anaconda Copper Company, one of Montana's largest employers, announced that it would close all of its mines and smelters in the state, leading to the loss of thousands of jobs and a significant economic impact.

5) The Montana State University Billings campus was established on June 9, 1965, becoming the first publicly-funded university in the state to be located outside of Bozeman or Missoula.