Technically Polygamy is not illegal in the USA. The actual law is state level and is written as "if you are married you cannot marry again in this state". If you have multiple wives you can immigrate them to the USA legally as long as married outside of the USA.
So if you found two chickadees that got along with each other and hit your fancy would you be able to man up a house with two wives? You dont have to immigrate them to the USA or anything but two wives in one house/one family
I have had this scenario (not married but lived together) with two women and all was wonderful for 5-years. Then one got "religion" and needed to be married and the rest is history. During the time it was going I can say two pairs of large C breasts are definitely better than one and two females blah blah blahing about nit-pick-shat is more than 2x as bad than just one lol.