I don’t even understand this...most every nation already has homo marriage. Just China and a few others don’t. The US may or may not have “led” this...but it certainly isn’t alone. This is the new world consensus.
Australia doesn’t have them. I don’t think it’s allowed in their Constitution, just civil unions. Australia is a great place for conservatives to emigrate too. I hope they don’t adopt sodomite “marriage” there.
Just Europe, North and South America (mostly) do. Most of Africa and Asia don't.