Why in Polygamy..

I think eventually it will be a more common thing. in the past there are a few reasons why it wasn't like that but the main reason is natural selection of cultural traits. if one culture is based on women having many husbands the consequence will be that many women will have no husband while others will have many. that limits the ability of this community to produce kids. if their neighbours are based on men having many wives the consequence will be that many men will have no wives but this has no consequence on the number of children produced by this community so one community will grow much faster than the other one and the tradition of one man with many wives will spread much faster so that is why humanity is the way it is. monogamy has some advantages over polygamy and for this reason its more common. natural selection of cultural traits.