Today's national holiday pairs perfectly with everyone’s favorite food. It's national pizza day.

For centuries, pizza was primarily a dish enjoyed in Italy.

In the early 20th century, the first American-style pizza shops popped up in New York and New Jersey, selling what was called "tomato pies.”

But pizza truly became part of American culture after World War II, as U.S. soldiers stationed in Italy developed quite the taste for it.

So, just how popular is pizza? According to the National Association of Pizza Operators, about three billion pizzas are sold in the United States each year.

The American pizza community says there are 34,000,000 different ways to order a pie depending on size, cheese, crust, sauce, and toppings.

Enjoy your favorite today, and of course, don't forget the wings and bleu cheese.