Country: Iceland
Year legalized: 2010
How it happened: It seemed fitting when Iceland -- the only country in the world with an openly gay head of state -- passed a law (by a vote of 49 to zero, no less) permitting same-sex marriage. Shortly after the law came into effect, Iceland's prime minister, Johanna Sigurdardottir (pictured above), married her longtime partner, Jonina Leosdottir.
Halldor Kolbeins/AFP/Getty Images


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