Almost Right, Part III
This is looking like a series.
The cartoon A Concise History of Black-White Relations in the US is almost right.
All that's needed is a third party (post-slavery immigrants) to climb a ladder to the platform and then be told by the guy who climbed on the back of the slave to give the ex-slave a hand up or else be considered a racist.
If you want to be nasty, you could have a fourth party (post-civil-right-law immigrants) climb up by ladder while the ex-slave is waiting to be helped.