I am not referring to chains, rather restaurants that serve calssic american diner food or BBQ or Southern soul food? I was talking to a German co-worker and he said you will nto find an Americn nor an English restaurant in Germany. Mexican, Irish Pubs, Turkish, Greek, Italian, but not American.
The other noteable comment was there are no chain restaurants in Germany. They don't have a KFC, McDonalds, Olive Garden equivalent. No House of Wurst. I find that very interesting.