1907 The post office at Ralston established.
1908 Fire destroyed Shoshoni's downtown. Attribution: On This Day.
1916 The 7th and 10th Cavalry Regiments enter Mexico to join the Punitive Expedition. The 10th had been garrisoned in Wyoming early in the 20th Century, although I don't know where it was garrisoned at this point in time.
The Punitive Expedition: The Casper Daily Press, March 16, 1916
This may be the first one of these that was really fairly correct in that the American intervention was indeed very unpopular in Mexico.
1942 Cheyenne's USO recognized as the best in the nation. Attribution: Wyoming State Historical Society.
1943 President Roosevelt created the Jackson Hole National Monument, a controversial Federal reservation that was widely opposed in Wyoming. Governor Hunt threatened to use the Highway Patrol to prevent Federal authority on its grounds. Congress, for its part, refused to appropriate money for the monument. The controversy endured until 1950, when the monument's lands were incorporated into the Grant Teton National Park and the National Elk Refuge.
1963 Workmen commenced pouring cement for the Yellowtail Dam for the Big Horn Reservoir.