sentences:  It was traditionally used by Native Americans in the Southern United States, and was adopted into Louisiana Creole cuisine.Use of Filé powder by the Choctaw in the Southern United States in cooking is linked to the development of gumbo, the signature dish of Louisiana Creole cuisine that features ground sassafras leaves.Sassafras roots are used to make traditional root beer, although they were banned for commercially mass-produced foods and drugs by the FDA in 1960.