Check out this amazing, zoomable map of all of the roads in the United States, and nothing else. No borders. No topographical features.
No, no. Click on the BIG one.
And supposedly, half the people live in this circle, most of which is water.
And bad research yields poor maps. When you assume that racists are located where words that you call pejoratives are tweeted from, you get a map like this. Note also that in south Texas, for many, the term "wetback" is not used as a pejorative, but rather as a descriptor of a person who illegally migrated across the Rio Grande. I have the utmost respect for Latinos, and of immigrants, but I used the term in a non-derogatory way for years, before being informed that it was being perceived as pejorative.