Can your husband have more than one wife?

Absolutely not because his allegiance is to that one woman, his wife, and her only. If he can't be faithful to her, then he shouldn't be married, period.

I don't think that's legal in the US, but in some countries it is. A man can have more than one wife, yeah. But not in the US, I don't think that's possible.

If he has more than one wife, he's not your husband.