This short book focuses on the Marriage Equality movement, looking at the history of marriage, the history of lesbian and gay movements, and the demand by same-gender oriented people for the right to marry. It also offers an overview of some of the main social movements in the United States (early 1800s to the present), the conditions necessary to facilitate social movement activism, the repertoire of strategies used by activists, and offers insights on the present and future of identity-based social movements.