People might be racist because they don’t feel comfortable around another race because they have never talked to someone of that origin so instead of trying to come up with a conversation they find it easier to make fun of them. I think racism is a problem because it doesn’t let people fully speak with one another clearly.
The major physical feature that you would have to cross in order to reach this destination would be the Appalachian Mountains, since these were so large that they discouraged travel to this region for quite some time.