"The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of sex. Congress shall have power to enforce this article by appropriate legislation."
The nineteenth amendment guaranteed women the right to vote. This eliminated gender as being a restriction in voting.
This illustration shows two women, advocating their rights to vote. Many women held signs like the one above, showing others what they wanted.
Women's Right to Vote Timeline
The above link is a timeline of how women earned the right to vote. It begins with the first women's right convention in Seneca Falls, New York in 1848 and goes to the nineteenth amendment in 1920.