In 1848 in Seneca Falls New York, Elizabeth Cady Stanton and Lucretia Mott organized the first Women's Rights Convention to discuss women's equality ~ including the right to vote. 
Wyoming Territory was the first territory to grant women the right to vote in 1869. In the late 1890's, Idaho and Utah followed suit.
On August 26, 1920, the 19th Amendment to the Constitution of the United States was finally ratified. This finally gave ALL American women the same rights and responsibilities of citizenship as men!
Women fought hard for you and I to have this right.
Get yourself to the polls this year and exercise that right!
