Marriage is both ubiquitous and central. All across our country, in every region, every social class, every race and ethnicity, every religion or non-religion, people get married. For many if not most people, moreover, marriage is not a trivial matter. It is a key to the pursuit of happiness, something people aspire to—and keep on aspiring to, again and again, even when their experience has been far from happy. To be told, "You cannot get married" is thus to be excluded from one of the defining rituals of the American life cycle.
The keys to the kingdom of the married might have been held only by private citizens—religious bodies and their leaders, families, other parts of civil society. So it has been in many societies throughout history. In the United States, however, as in most modern nations, government currently holds those keys. Even if people have been married by their church or religious group, they are not married in the sense that really counts for social and political purposes unless they have been granted a marriage license by the state. Unlike private actors, however, the state doesn‘t have complete freedom to decide who may and may not marry. The state‘s involvement raises fundamental issues about equality of political and civic standing.