As a foreigner when in The States, I have a UK passport. The terms of which allow me passage etc and recognition of my personal state. Being married, that means I am married regardless of where I am. As I am married to a lady, Wyoming has no issue with me but I thought on this as the other year, three couples, ourselves including, went skiing at Jackson Hole. One of the couples were women, the other men. Both couples with civil partnerships.
If we go again, (the skiing was great, the hospitality splendid, the moose drool tasty,) we have no issue either as our friends will be recognised, as The USA has to do as it is told.
Just like every other country that is signed up to the relevant treaties.
Cowboys who live a long way from the sea may not like it, but distance to civilisation is no excuse for letting your bigoted creeps vote through their institutionalised superstition.
Why does the best geography have the worst attitudes? France springs to mind whilst I am on a rant.