Oregano’s widespread popularity truly surged after U.S. troops served in southern Europe during Italy in the 1943–45 campaigns of World War II.
Many American soldiers encountered everyday Mediterranean cooking for the first time, tomato sauces, roasted vegetables, and especially Neapolitan-style pizza seasoned with oregano and basil.
Returning veterans brought back not only memories but tastes, and as immigration from Italy resumed and expanded after the war, restaurants in cities across the United States began adapting and popularizing these flavors for a broader audience.
What had once been a relatively niche herb associated with Italian immigrant kitchens started appearing in American home pantries, canned sauces, and military-influenced cookbooks of the late 1940s and 1950s.
The transformation also reflects broader cultural exchange during the Allied occupation of southern Italy, particularly around Naples, where American servicemen were exposed to traditional street foods and rustic herb-heavy dishes.
Food historians note that postwar demand for pizza in the U.S. and the rise of commercial pizza chains in the 1950s created a steady market for dried oregano, which traveled well and matched American preferences for bold, savory seasoning.
Thus, oregano’s “arrival” was less a sudden discovery and more a culinary diffusion: wartime contact accelerated the adoption of a Mediterranean herb that then became inseparable from the American idea of pizza and Italian-American cuisine.
