Well, I have never been anything other than white, but I gather it is easiest to be white in America. You are much more likely to be picked up and treated well in some parts of rural America. (Rural america is usually next door to the wilderness I have experience hitchhiking in, etc.)

Louis CK: https://www.youtube.com/watch?v=6CmzT4OV-w0 -- Comedy can express what terse and technical explanations may not.

Edit: getting picked up easier usually means less environmental risk so it isn't just safety from whoever is picking you up at play.