This is the best map of the worst pizza. It shows the nearest pizza place to each location, from among nine popular chains.
You can see the dominance of Pizza Hut, its abundant red squares scattered across the land like pepperoni. And Domino's in blue is also doing well throughout the East. But there are still regional favorites, many of which are fairly unheard of outside of their spheres of influence.
Check out what Godfather's Pizza (in brown) is doing in Iowa. (Why Iowa? The chain was founded in neighboring Nebraska.) And Papa Murphy's pizza (in green) is spreading out on the West Coast. (It was founded in Vancouver, Washington.)
For more, see 40 maps and charts that explain food in America.