The American troops involved in the Italian campaign took their appreciation for the dish back home, touted by "veterans ranging from the lowliest private to Dwight D. Eisenhower." Two entrepreneurs, Ike Sewell and Ric Riccardo, invented Chicago-style deep-dish pizza, in 1943. They opened their own restaurant on the corner of Wabash and Ohio, they wanted to invent pizza nobody’s ever heard of.