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AHC: Make Monogamy Illegal

So, for this Alternate History Challenge, I want you to try and create a scenario in which, by the present-day, the world's attitudes towards monogamy ITTL are comparable to OTL's attitudes towards polygamy, and vice-versa, with the practice of marriage exclusively between only two parties deemed to be illegal by the majority of the world's nations, and forbidden in the majority of present-day societies. Any form of polygamy is permitted under this criteria- for instance, serial monogamy in a society without the institution of divorce would count as polygamy. So, is this plausible? And how might such an outcome be brought about?
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