America has a socialist form of marriage. In the past we had a free market for marriage but one runs into Pareto's principle where 20% of the males would have access to most of the desirable females. If America had a free market in marriage and not a socialized one well db phoenix might not ever get any. So we limit marriage to one at a time. Trump has had 4 wives but could afford many more, Guiliani and Gingrich 3 wives and multiple girl friends so we simply block people such as this from acquiring more than 1 wife at a time which they simply could afford, so polygamy is outlawed so that poor men can have a shot at reproduction.