That is because the founders, who so many fetishize, were generally anti-democratic monarchists who decided early on that nearly everything including protecting their private property rights in slaves was more important than the right to vote, which was grossly restricted at the time the Constitution was ratified by property requirements. Indeed, the ratification of the Constitution was a ritual that only about 7-8 percent of the colonial population participated in; in toto about 4 percent of the population, and those being the wealthiest, ratified the document that so many all across the political spectrum now tout as incontrovertible. Meanwhile, most spend their time trying to conform to a lack of government rather than trying to generate a government that can meet the needs of the country's population because the same rich people who founded this country are now in nearly complete control of it. It is widely believed that George Washington, the fetishized first president, was the richest man in the United States at the time of his ascendency to the presidency.
Source, because people here are so hung up on sources: Toward an American Revolution: Exposing the Constitution & Other Illusions (1988).
For women and sympathetic men (although I haven't seen many here yet) more generally here are two recent reads:
The Rosa Luxemburg Reader (2004) which contains some of her feminist writings. She has largely been portrayed as uninterested in women's issues but this isn't an accurate depiction and some of the writings here go some way to debunking that conception.
Red Feminism: American Communism and the Making of Women's Liberation (2001) by Kate Weigand. A recuperation of the role of communism and communist thought in the making of feminism.