Among the most popular foods eaten by Americans each year is pizza. From a thin crust cheese pizza to the thickest, topping filled pleasure, the typical resident eats more than 3 dozen slices each year. In addition to pizza, a lot of chains offer a range of other dishes. The 4 largest chains in the nation are Dominos, Papa Johns, Little Caesars, and Pizza Hut. Each has a unique history and have grown their menu as the chains broadened.