Feminism in the United States refers to the collection of movements and ideologies aimed at defining, establishing, and defending a state of equal political, economic, cultural, and social rights for women in the United States. Feminism in the United States is often divided chronologically into first-wave, second-wave, and third-wave feminism. As of the most recent Gender Gap Index measurement of countries by the World Economic Forum in 2014, the United States is ranked 20th on gender equality.