"Most American men are polygamists. Only they do it one wife at a time."
Actually no. The divorce rate is so high because of serial divorcees. Most couples who get married stay married. If a man marries and divorces twice, that's two divorces compared with a couple who stays married (0 divorces).
ok. The point remains though. a very large percentage of American men practice the next to worst form of polygamy. A smaller, but large, proportion of men practice the worst form, impregnating multiple women while never assuming any responsibility whatsoever.
BYW: It is only ilegal because of a document. It' interesting that a man could cohabitate with 100 women if he chose and have children with all of them, quite legally, as long as he didn;t try to marry them.