It is as if you have never heard the terms, "tradition", "culture" or "practice". Leave the Dark Ages, come out into the light. It is a real eyeopener.
OK, so different cultures have different traditions, and so they consider different practices as morally acceptable or unacceptable. Fine.
But we're all human beings, regardless of the culture we live in. You don't consider slavery to be wrong. Is it only not-wrong in the US, or are there other cultures in which slavery is also not wrong in your view?