I am not absolutely sure whether or not the 'right on red' rule applies to all States, but certainly it does in all the mid-West States that I have driven in (Iowa, Minnesota, Wisconsin, Kansas & Missouri).
Amusingly, I was following a car driven by American colleagues during a business trip to Denmark and was astonished to see them blithely apply the rule! Luckily for them there were no Polizei about.
Keith (M)