I personaly think slavery isn't a bad thing, but people used to make it (and still do, in many places) so the people would be under oppression and a lot of stress. They are treated like animals- being sold or traded on the black market.
I know it violates the Thirteenth Amendment, but, if we looked at it in another point of view, it could benefit the lower class and/or the third world, if it were regulated. The government could approve laws that moderated the number of "owners" and "workers". By this, I mean that a person could only "own" a fixed amount of people, and this person would be required to fill certain requesites to be allowed to own anybody who is willing
to give him or herself away.
And the slaves would have laws that could protect them, and institute a minimum price. For example, they can not be abused in any form, and they are required to be mantained in habitable conditions.
If it where this way, slaves wouldn't be called slaves. They would be called in another term, like "owned".
Anyway, I would like to hear your point of view, and if you think my way of thinking is wrong, please, feel free to post.