On December 10, 1869, John Campbell, Governor of the Wyoming Territory, approved the first law in U.S. history explicitly granting women the right to vote.

Commemorated in later years as Wyoming Day, the event was one of many firsts for women achieved in the Equality State.

On November 5, 1889, Wyoming voters approved the first constitution in the world granting full voting rights to women. Wyoming voters again made history in 1924 when they elected Nellie Taylor Ross as the first woman governor in the United States.

The events leading up to the passage of the 1869 suffrage law were put into motion by Esther Slack Morris, a pioneer whose ears were ringing, according to one account, with "the words of Susan B. Anthony" when she arrived in South Pass, Wyoming in 1869.