I see no problem with slavery in certain realms. For instance, if a man were to steal something from another man, he should be brought to trial, and if found guilty, he should pay back the value of what was stolen four fold. If he could not pay, then he would become a 'slave' to that man until his debt to that man was paid off. The 'slave owner' would be required to provide food, shelter, and clothing to the slave along with compassion so as to win the slaves heart away from doing that which is considered wrong.
Another instance would be prisoners of war. They could be held as prisoners of the government and made to work in the land to help 'pay the debt' of war. When the cost of the war had been 'replenished' to the Treasury, then the captives would be released back to their homelands.
You see, we may have passed a law or amendment abolishing slavery, but that doesn't mean it has ended. Every person in an American jail has lost his rights as a free man (although that could be argued otherwise). He must remain a slave to the judicial system until his 'debt to society' has been paid in full.
What I'd be more concerned about is the other slavery in America. Our lust to be 'slaves to sin'. We are slowly giving up our 'rights endowed to us by our Creator', to be slaves to the sins of fornication, adultery, sexual immorality, greed, debauchery, drunkeness, slander, malice, rage, envy and the like.
For that we won't have to worry about the the American judicial system punishing us, God will not be mocked, a man reaps what he sows.