Women's suffrage and equal rights were advocated for in the Declaration of Sentiments by Elizabeth Cady Stanton. The document argues that as citizens, women should have all the privileges and immunities of the Constitution, including the right to vote and hold office. It notes that women make up half the population so they should have a say in electing officials and passing laws. Additionally, the 15th Amendment guarantees all citizens the right to vote regardless of race or servitude, which supports extending suffrage to women as well.