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In the Americas "an estimated 852 million people live in countries with marriage equality," five-sixths of the total population. hrw.org/news/2022/06/27/americas-should-unify-marriage-equality-bloc
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Legalization of marriage equality in the hemisphere was helped along by a ruling from the Inter-American Court of Human Rights.
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Ratifying the American Convention on Human Rights, and passing enacting legislation acknowledging the Court's jurisdiction is one way to expand rights protections in the USA without a constitutional amendment.