I’d like to address the whole Mormon thing. Are you talking about Mormons back in the days of polygamy, or renegade people who aren’t Mormon who practice polygamy these days? Because while the latter are, in my opinion, pretty vile–they seem to marry an awful lot of young girls, etc., the original LDS polygamy was a little different:
a) Not that many people were really polygamous, and a new marriage had to be approved not only by the first wife, but by Church officials. This cut down quite a bit on abuse, although it happened (just as abuse happens in marriages now, too).
b) First wives often did the picking, choosing sisters or friends, and it was not uncommon for young women to decide to marry a man who was already married–this was the frontier, you know, and a settled man with property and family could be a good bet when compared with a younger man who had nothing yet.
c) There is evidence that polygamy, far from being oppressive, was very liberating for women. They had their own households–and remember, husbands were often gone on missions for years at a time. Insanity from loneliness, common on the prairies where neighbors were few and far between, was not a problem. Women could trade chores, avoiding jobs they hated and getting more done while one person watched the children. Many women left their children in their sister-wives’ care and went East to school–Utah’s doctors were nearly all women for years. (much easier on the children, too–they stayed home with ‘Auntie,’ who they’ve known their entire lives, instead of moving.) Remember, too, that Utah women had the vote before they were allowed into the Union.
I have read quite a bit on early Mormon women, and by and large, they were an amazing bunch who didn’t put up with much. I can recommend Polygamy: a history, from the Signature Press as a good source. For those who are unfamiliar with the LDS world, Signature is something of a maverick press–not owned by the Church, quite intellectual, known for its cutting-edge publications.