1805 The Corps of Discovery breaks camp among the Mandans and resumes its journey west along the Missouri River.
1836 Skirmish between Texans and Mexican troops at San Felipe Ford.
1869 John Campbell sworn in as Wyoming's first Territorial Governor. Campbell had been a brevet Brigadier General in the Union Army during the Civil War, serving on Gen. John M. Shofield's staff. He would later serve in the office of the US Secretary of State and as American Counsel at Basel Switzerland before dying in 1880 at age 44.
1870 Residents of Miners Delight, lead by Captain (from the Civil War) Herman G. Nickerson, attacked a band of Arapaho lead by Black Bear, killing 14. The raid had intended to intercept and attack a party of Arapaho under Little Shield who had a attacked two residents of Miners Delight the day prior. Tension between locals and Arapahos on the Wind River Reservation had been high for several months. Black Bear's band, however, had merely been on its way to Camp Brown to trade.
1892 Dissension came to a head in the Johnson County Invasion resulting in Frank Wolcott resigning command of the expedition and ceding it to Tom Smith and Frank Canton, with Smith "commanding" the Texans. To add to their difficulties, a heavy snowstorm broke out.. The party broke into two groups with some men becoming lost in the process, including Wolcott who spent the night in a haystack as a result.
1916Casper Weekly Press: April 7, 1916
The Casper Weekly Press was apparently the Friday edition of the paper.
1922 Ground broken for the town of Parco. Parco still exists, but it is now known as Sinclair, and is the site of the Sinclair Refinery. At the time of its founding, it was the location of a very nice hotel on the Lincoln Highway. The hotel's buildings still exist, but the hotel itself is long closed. Attribution: Wyoming State Historical Society.
1922 U.S. Secretary of Interior leased Naval Reserve #3, "Teapot Dome," in Wyoming to Harry F. Sinclair.
1933 Prohibition repealed for beer of no more than 3.2% alcohol by weight.
1943. On this day, the sale of coffee was banned in Cheyenne and Casper due to violations of wartime rationing restrictions.
1947 United States v. Wyoming, 311 U.S. 440 (1947) argued in front of the United States Supreme Court. The topic was the ownership of school sections, and the suit had been brought by the US against Wyoming due to a controversy regarding oil royalties.
1994 A 5.2 magnitude earthquake occurred 90 miles from Evanston, WY.