1926  John Higgins wills entire estate ($500,000) to Wyoming. Queen Marie of Romania visits state.

1927 Wyoming aeronautics law is passed. Gros Ventre dam breaks and wipes out town of Kelley. Senator Francis E. Warren dies; served as U.S. Senator 1890-93. Frank Emerson is inaugurated as governor.

1929 Honorable Patrick J. Sullivan is appointed to fill unexpired term as U.S. Senator.  Grand Teton National Park is established.

1930 Population, 225,565.

1931  Fort D. A. Russell is officially renamed Fort Francis E. Warren. 6,000 people stage outdoor celebration at Independence Rock. Governor Frank Emerson dies in office. Wyoming Air Service officials fly to Sheridan from Casper with passengers and mail.

1933 Allocation of $22,700,000 is made for Casper-Alcova Reclamation Project. New Federal Building is completed in Cheyenne.

1934 Wyoming Air Service begins airmail route between Cheyenne and Billings, Montana. Democrats win every state elective office and majority of seats of state legislature.

1935  Lethal gas made official method of capital punishment. A two per cent sales tax is adopted. State liquor commission created; state becomes a wholesaler of intoxicating liquors, not including beer. December 10 designated as Wyoming Day.

1936 Aeronautical Commission is created. Terms of county elective officers are lengthened to four years. Columbus Day, October 12, is made a public holiday by legislature. Wyoming Home for Dependent Children completed in Casper. General John Pershing visits Cheyenne. Old Cheyenne Club, landmark, is demolished. President Franklin D. Roosevelt visits Wyoming three times during the summer.

1937  New Supreme Court and Library Building are dedicated. Justice Willis Van Devanter resigns from the United States Supreme Court. Ex-Senator Robert D. Carey dies. Social Security and Unemployment Insurance laws are enacted. Wyoming Landmark Commission purchases old Fort Laramie. University holds Semi-Centennial Celebration. A United Airlines passenger plane crashes in Wasatch Mountains with nineteen aboard.

1938  Fort Laramie is taken over by federal government and made 74th National Historic Site. Alcova Dam is completed. Republicans gain political control of state government by electing three out of five state officials and a majority of legislators. Final judgment of $6,364,677, less costs of suit and all of the Government's non-treaty expenditures for the Shoshone since 1868 is granted to Shoshone Tribe in satisfaction of claims brought against federal government for the value of land in the Shoshone Reservation occupied by the Arapahoe for 60 years. This decision clears title to 2,343,540 acres of Wyoming land; gives legal status to homes of more than 1,000 Arapaho; and brings to the Shoshone about $4,000,000.

1939  Trona discovered in Sweetwater County.

1942  Heart Mountain Relocation Center established in Park County.

1945 Legislation enabling junior colleges is passed.

1947  Fort F.E. Warren becomes Francis E. Warren Air Force Base.

1949  Severe blizzard paralyzes entire state.

1950  First woman jury since 1870.