The first major legislative act advocating for women's rights in the United States was the Seneca Falls Convention of 1848, where the Declaration of Sentiments was drafted. Organized by leaders such as Elizabeth Cady Stanton and Lucretia Mott, the convention called for equal rights for women, particularly the right to vote. Although it wasn't legislation per se, the Declaration laid the groundwork for future advocacy and legislative efforts. The early suffrage movement gained momentum, inspiring generations of activists to fight for women's rights, ultimately leading to the passage of the 19th Amendment in 1920, granting women the right to vote.