This is an attempt to maximize the most noteworthy restaurant chain (with an emphasis on fast food where possible) associated with each state. Could mean it was founded there. Could mean it's headquartered there. Could mean both. There were some tough calls (click here for more detail on the decision-making process), see if you agree with them.
Again, this was done with an eye towards businesses with local resonance but national notoriety. Except for the Dakotas. What are we going to do with you, Dakotas?