Map of states and territories in which women vote
The admission of western territories as new states advanced the right of women to vote. These territories had less rigid social customs, and were anxious to acquire the number of voting residents needed to meet statehood requirements. In 1913 women voted in Wyoming, Idaho, Utah, and Colorado. Not until the ratification of the 19th Amendment in 1920 did women win the right to vote in the United States as a whole.
Courtesy Schlesinger Library, Radcliffe Institute for Advanced Study, Harvard University