What behavior of 19th century Mormons are you referring to? The majority of polygamous relationships were about taking responsibility for widows and their families. Mormons were violently persecuted and polygamy was a support mechanism.
Yeah, I edited it to "supposed behavior" because I don't really have a good basis of knowledge about 19th century Mormons. It's just that, fairly or unfairly, they're usually the ones held up as an example of how polygamy is supposedly abusive and sexist.
