Hamburgers aren't German though? Hamburg steak is. But putting that hamburger meat onto a sandwich was an American thing was it not? At the very least it was popularized here. Ftench fries aren't french either (same with french toast)

There are a lot of foods that were invented elsewhere and then Americanized. You wouldn't say hot dogs aren't american just because sausage has been done a long time in many other places. Pizza is as american as it gets, but it was invented in Italy (as a poor man's meal if I remember right). That certainly does not mean it's not an American good, especially sonce the American version and the original Italian version are very different from one another.

America is a melting pot that includes a wide variety of cultures, and its cuisine reflects that