Any civilized country.
I'm sure most countries would outlaw polygamy ! I'm glad it's outlawed here as one wife at a time is plenty ! Horrible thought of having more than one ! Or two or three ex wives at once ! Sends chills down my spine !
Personally, I see nothing wrong with the concept of multiple spouses.
I mean, it's not something *I* would participate in... But if they all love each other, are consenting adults, and it works for them - who is anyone else to keep them apart?
Vatican City State.