I need to find a picture depicting american slavery

I need to find a picture depicting american slavery?

I'm doing some work for a Language Class and I have to respond to how the American slave system not only dehumanized the slaves, but also the slave owners themselves. I'm writing this in a sort of 'readers journal' and my teacher likes to see pictures in there. So I'm wondering if anyone can post a link to a picture which depicts the slave owners as beind the dehumanized ones or something along those lines. Thanks in advance!