As of 2016, how many countries (including the United States) have enacted lawful same-sex marriage in name, as well as in practice?

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As of 2016, a total of 22 countries (including the United States) had enacted lawful same-sex marriage in name as well as in practice. These countries are Argentina, Belgium, Brazil, Canada, Colombia, Denmark, Finland, France, Germany, Iceland, Ireland, Luxembourg, Malta, Mexico, the Netherlands, New Zealand, Norway, Portugal, South Africa, Spain, Sweden, and the United States.

As of 2016, How Many Countries (Including the United States)