@Charles W,
Wow...this thing revisited after all this time.
No matter his message, Charles, the question remains: Why do you suppose Jesus never condemned slavery?
One possible answer is...he simply did not think there was anything wrong with it.
The god he worshiped indicated there was nothing wrong with it, am I correct?
Perhaps it is, as RL suggests, a moral rather than political question...but answered the way most humans would have answered it back then.