Which movement aimed to secure equal rights for women in the United States?

The Women's Liberation Movement is the correct answer because it specifically focused on achieving gender equality and advocating for women's rights in various aspects of society, including the workplace, education, reproductive rights, and legal equality. Emerging in the 1960s and 1970s, this movement sought to challenge and change the traditional roles of women, address issues such as discrimination and sexual liberation, and promote equal opportunities.

The Labor Movement, while significant in advocating for workers’ rights, did not exclusively focus on women’s rights, although it did include women within its broader efforts. The Green Movement is primarily concerned with environmental issues and sustainability, not gender equality. The Civil Rights Movement aimed to end racial discrimination and secure civil rights for African Americans, which, while intersecting with gender issues, was not solely focused on achieving equal rights for women.