The word pizza was first documented in A.D. 997 in Gaeta, Italy
No doubt Pizza was first invented and mainly eaten in Italy for centuries
It is also claimed that somewhere between the 17th to 18th century at Naples (in then Europe) a restaurant runner tried a dish of bread with toppings of tomato, onion, small fish, and cheese for workers and all liked it a lot
With easy and quick preparation, deliciousness in taste, variety in toppings, Pizza became popular soon
When King Umberto and Queen Margherita tasted this dish, they liked it so much and adopted it; till then Naples had become part of Italy
After the second world war, Pizza reached America with migrated labors and workers
Further, it reached all over the world and changed toppings as per local availabilities and food preferences, habits, likes, etc.