Argentina early this morning became the tenth nation to make same-sex marriage legal.
Argentina
Belgium
Canada
Iceland
Netherlands
Norway
Portugal
South Africa
Spain
Sweden
Same-sex marriages are also performed in Mexico City and in Connecticut, D.C., Iowa, Massachusetts, New Hampshire and Vermont.
Civil unions and registered partnerships are recognized in:
Andorra
Austria
Colombia
Czech Republic
Denmark
Ecuador
Finland
France
Germany
Greenland
Hungary
Luxembourg
New Caledonia
New Zealand
Slovenia
Switzerland
Wallis and Futuna
United Kingdom
Uruguay
And parts of Australia and Mexico, and the states of California, Colorado, Hawaii, Maine, New Jersey, Nevada, Oregon, Washington and Wisconsin.
Maryland, New York and Rhode Island recognize same-sex marriages performed in other states (as the Constitution requires).