Lesbian history in the United States has long been mischaracterized as mere "romantic friendships" but the acceptance of lesbianism has gradually increased over time. In the late 19th century, some lesbian relationships were openly acknowledged among suffrage supporters. The 1964 Civil Rights Act prohibited gender discrimination and lesbian activists in the 1960s and 70s helped pave the way for greater acceptance of LGBT people. By the early 21st century, more gay and lesbian families felt able to openly identify themselves in the US Census and same-sex marriage was legally recognized in some states.