Government wants a monopoly on the contract. I have no problems with governemnt upholding the contracts agreed upon by private individuals, but governemnent has no legitimate authority to set the terms of the contracts themselves.
You seem to have ignored my comments about universiality and human history, Furthermore, polygamy is legal in Saudi Arabi and other countries, which are outside of Africa.
They do not. They have given an extremely limited criteria to the contract they will recognize as marriage. That limitation arises out of what is culturally held as a supermajority holding. That criteria is that the contract be exclusively between 1 man and one woman.
" polygamy is legal in Saudi Arabi and other countries, which are outside of Africa."
Right, the religion of berkkas, stoning, beheading and in general, pieces... This is the US and marriage is between 1 man and 1 woman.