1870 The location that was to become Evanston was surveyed on June 1, 1870.
1898 The Trans-Mississippi and International Exposition opened in Omaha on June 1, 1898 and lasted through October. The theme was "Progress of the West." Wyoming participated in various ways, and had a particularly strong agricultural exhibit. "Wyoming Day" was held on September 19.
1925 Construction of the Guernsey Dam was started on June 1, 1925 and completed in July 1927.