According to Pew Research poll data, in 2001, the majority of Americans opposed same-sex marriage—57 percent against, 35 percent in support. As of 2015, a majority of Americans (55 percent) supported same-sex marriage, with 39 percent expressing opposition. The landmark case, in which the U.S. Supreme Court held in a 5–4 decision that the fundamental right to marry is guaranteed to same-sex couples, is likely further influencing opinions among U.S. citizens. Still, controversy and heated debate continues to ensue on the social, legal, and political implications of same-sex marriage. The second edition of presents thorough coverage of recent changes in the legal status of same-sex marriage in the United States as well as essays that provide historical perspectives on same-sex marriage; an extensive, up-to-date bibliography; a collection of primary source documents; a glossary; and a chronology that will serve readers studying the topic. New material includes a detailed discussion of the 2015 Supreme Court of the United States decision as well as coverage of issues that have arisen as a result of the Obergefell case, such as the debate over "religious freedom" and LGBT civil rights legislation.