Which important figure co-founded the National Woman's Suffrage Association with Susan B. Anthony in 1869?

The co-founder of the National Woman's Suffrage Association alongside Susan B. Anthony in 1869 was Elizabeth Cady Stanton. Her significant contributions to the women's rights movement, particularly in advocating for women's suffrage, were pivotal at that time. Stanton and Anthony worked closely together to promote the cause of women's voting rights and to organize efforts aimed at attaining this goal.

Elizabeth Cady Stanton was a prominent leader who had already demonstrated her commitment to women's rights by playing a vital role in organizing the Seneca Falls Convention in 1848, which laid the groundwork for the suffrage movement. Her collaboration with Anthony helped unify various factions of the movement and push for greater emancipation for women, ultimately influencing future legislation and social attitudes.

The other choices, while important historical figures, did not co-found the National Woman's Suffrage Association with Anthony. Lucretia Mott was indeed a notable abolitionist and women's rights advocate, but she was not a co-founder of the association. Harriet Tubman is celebrated for her work on the Underground Railroad, while Julia Ward Howe is remembered for writing "The Battle Hymn of the Republic," and both were influential in their own rights, but neither co-founded the National Woman's Suffrage Association.