She spent her honeymoon at an anti slavery convention

Elizabeth wed Henry Stanton in 1840, a well-known abolitionist and member of the New York Anti-Slavery Society. Following their nuptials, the newlyweds traveled to London for the World Anti-Slavery Convention, where Henry was a delegate and Elizabeth was compelled to sit in the rear of the lecture hall with other female attendees. She met feminist Lucretia Mott there, who agreed with her support of the rights of African Americans and women.

Elizabeth was in her twenties when she met her future husband, Henry Brewster Stanton, who was a visitor in the home of her reform-minded cousin Gerrit Smith. Elizabeth's life was completely turned upside down by Stanton, a representative of the American Anti-Slavery Society and a persuasive orator who called for the immediate abolition of slavery.

They wed in 1840 against her parents' wishes and left right away for London for the World's Anti-Slavery Convention. The conference there forbade the seating of female American delegates. One was just as imposing as Stanton's mother, despite being short, slight, and kind-hearted. The Hicksite Quaker preacher Lucretia Mott "opened to a new universe of ideas" through her agitation for women's rights, religious freedom, and other changes.