Elizabeth Cady Stanton was a key figure in the Seneca Falls Convention, which initiated the movement for women's rights in the United States. In 1848, Stanton authored the Declaration of Sentiments, which outlined grievances against gender inequalities. Her leadership and advocacy were crucial in rallying support for women's suffrage and social reforms. Stanton's efforts helped lay the groundwork for future generations of feminists, establishing her as a pivotal figure in the fight for gender equality.