What if - Poligamy in the US allowed?

About the only way to have the US legally allow polygamy would be to posit a much more widespread and influential Mormon religion or have significant and early immigration from non-western cultures that allow polygamy.
Not necessarily. There is the possibility of the 60's counter-culture gaining more ground, including the free love movement. If it does, there may be a greater openness earlier on to polyamorous relationships, up to and including polygamous civil unions or even marriage.
 
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