Because of the fact that immigrants from Naples, the city state, came to the US in the mid to late 1800s, it is entirely probable that American Pizza predates the country of Italy.

Thomas Jefferson was obsessed with Macaroni, and created the dish that modern day mac and cheese is based on. He served it at a ton of White House dinners. He also was the person responsible for shipping macaroni extruding machines from Italy to the US while he was a diplomat over there.