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The many green dots in Louisiana and Tennesee are mostly just regular high schools (there are more), and many don’t teach creationism, so this is a bit of an exaggeration. In Texas, however, the red dots are Responsive Ed schools that can and do teach creationism. The orange dots in other places are largely Christian schools that are publicly funded and do teach creationism.

The public funding for religious schools rolls all the way back to all-white schools set-up after passage of the Civil Rights Act. Confederate states don’t mind refuting the Constitution when it combines separation of church and state with racism. Creationism is just a bonus.