Majority of what we consider fast food has German roots... since they are largest ethic group in America... the Culinary and Gastronomy History of the American palate you can follow migration patterns of the German and see their ppl food practices (butchering techniques and curing/preserving) that followed some are even included in Soul Food... French not so much since we never truly as a country had a French immigration that really was ever strong... French Culinary practices are seen of course in Louisiana, Mississippi, Alabama, and North Florida... while Germanic is damn near the entire midwest, ahotspots in the tri states and strong ties to Texas BBQ which has a combo of Black American, Mexican, Germanic, and Scandinavian influences.