Read all about it, here. This seems like much ado about little, to me. Of course there were slaves during the early part of our history. Every child is taught that in school. So what's all the hubbub, bub? Those who care about the issue have already educated themselves on it to the extent of their caring. Those who don't care about it will walk by with hardly a glance. Somewhere in the middle, most people will take a cursory look around and think to themselves "Slavery, yeah, terrible thing, glad it's not around anymore", and then move on to see Independence Hall, the Liberty Bell, and hunt down an authentic Philly cheesesteak.