Suffrage for American women was first seriously proposed at Seneca Falls, New York on July 19, 1848, when Elizabeth Cady Stanton, Lucretia Mott, and several others issued a general declaration on the rights of women. Early leaders of the movement were divided on whether to seek one federal amendment or passage of state-by-state amendments for women's suffrage. This conflict lasted until 1890, when the two sides joined forces as the National American Woman Suffrage Association. By 1913, twelve states and territories had granted women the right to vote within their borders, which led to the passage of a resolution in Congress and ratification by state legislatures. The passage of the Nineteenth Amendment in 1920 guaranteed American women the right to vote nation wide.