National Pizza Day! Whether it is thin crust, Chicago style, deep dish or anything in between, pizza is an american favorite. Here are some interesting facts about pizza: Pepperoni is on approx 36% of all pizzas ordered, making this topping the most popular. Over 3 billion pizzas are sold in the USA each year. Add another 1 billion on frozen pizzas 17% off all USA Restaurants are Pizzerias. Gennaro Lombardi, the first Pizzeria in the United States, opened in 1895 {Read More}