Pizza is truly a universal food

Pizza is truly a universal food that almost everyone enjoys.
Basic pizza most likely began in prehistoric times, with bread cooked on flat, hot stones. Pizza is a baked pie of Italian origin consisting of a shallow bread-like crust covered with seasoned tomato sauce, cheese, and often other toppings such as sausage or olive. The word pizza is believed to be from an Old Italian word meaning "a point," which in turn became the Italian word "pizzicare," which means "to pinch" or "pluck." Pizza is an oven baked, flat, round bread typically topped with a tomato sauce, cheese and various toppings. Pizza was originally invented in Naples, Italy, and the dish has since become popular in many parts of the world. October is traditonally national Pizza month.
The ancient Greeks covered their bread with oils, herbs and cheese. Modern pizza originated in Italy as the Neapolitan flat bread. The bottom of the pizza, called the "crust", may vary widely according to style could be thin as in a typical hand-tossed pizza or Roman pizza, or thick as in a typical pan pizza or Chicago-style pizza. 
The most popular cheeses to use on pizza are mozzarella, provolone, cheddar and parmesan. Romano and Ricotta are often used as toppings and processed cheese manufactured specifically for pizza is used in mass-produced environments.
few facts..
Pepperoni is America's favorite topping and the other popular pizza toppings are mushrooms, extra cheese, sausage, green pepper and onion.
Ever wondered why is pizza round?
What could the answer be? ?
If you'd ever seen an American chef prepare it, after the dough has been mixed, kneaded and has risen, the dough ball gets formed into a flat disc in the air by rapidly spinning it and flattening it with the chef's hands. The round spin imparts a circular shape on it.
In Italy they will toss them, spin them and then reshape them into a rectangle or square and cut them in square pieces to serve to guest. Also when the pizza is round for the heat to spread evenly.
The second answer searched was .. Round is the easiest shape to make the dough. When you toss dough, it doesn't form a square, corners take a little more work. Sheet pizzas are rectangular but you may have never seen one locally.