North Carolina bans gay marriage

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2-The fundamental boundary of a marriage has always been between a man and a woman. In certain other places, men married several wives, or women married several husbands, but the concept remained the same. There was a wife, and a husband.

That isn't true... in Ancient Greece and Rome, Same-sex marriage was celebrated. I am sure there were other places aswell. Definitions change, deal with it.

That is true. In ancient greece, homosexuality did not even exist in the form we know of it as today. It existed as pederasty. Still no marriage.
Likewise in rome. It existed in forms of lovers, children or grown men, who knows. But still, marrige was especially a union between a man and a woman.
Now let's look at other places on earth. Say, China. Or India.
Or Turkistan. Or Britain. Or Gaul or wherever in the ancient world, homosexuality only existed as a secret vice of powerful people.
Never was it a part of society, and it never will be!
Definitions change, but it does not change according to things that are irrelevant to that definition. Can I change the definition of a neutron by sociological description?
No. Similarly, changing the definition of marriage is not changed by homosexuality.