This cartoon is years old, but it’s one of the best political cartoons I've seen.
It is effectively powerful, without being distasteful.
The creator seems to be anonymous, but goes by the pseudonym "Ampersand".
You can also find it at the link below.
http://www.amptoons.com/blog/archives/2007/06/13/a-concise-history-of-black-white-relations-in-the-usa-2/
