Same-sex marriage is recognized in several states of USA.
On November 2012, nine USA states have legalized the same-sex marriage. They are: Maine, New Hampshire, Vermont, Massachusetts, Connecticut, New York, Maryland (2013), Iowa and Washington. Also in the District of Columbia is legal.
On the same date, other ten USA states have legalized the same-sex civil unions or they grant them some rights. They are: Rhode Island, New Jersey, Delaware, Illinois, Nevada, California, Oregon, Hawaii, Wisconsin and Colorado.
In the rest of USA, the same-sex marriage or same-sex civil unions are illegal, and in some cases even prohibited by their constitutions.
Check the situation of same-sex marriage in Europe
Check the situation of same-sex marriage in the rest of the world