As of December 20, 2013, about 33% of US states have legalized same-sex marriage.

No federal laws prohibit same-sex marriage in the United States of America, Canada, or other countries where same-sex marriage is legal.

As of 2017, Peru does not have same-sex marriage. When it does, it will be recognized by the United States as well.

In the United States, there is no amendment to the federal Constitution that opposes same-sex marriage. Many states, however, have adopted amendments to their individual state constitutions that prohibit same-sex marriage.