Modern pizza evolved from similar flatbread dishes in Naples, Italy, in the 18th or early 19th century.
The word pizza was first documented in AD 997 in Gaeta and successively in different parts of Central and Southern Italy. Pizza was mainly eaten in Italy and by emigrants from there. This changed after World War II when Allied troops stationed in Italy came to enjoy pizza along with other Italian foods.
What is the Pizza history?
The history of pizza begins in antiquity, as various ancient cultures produced basic flatbreads with several toppings.

A precursor of pizza was probably the focaccia, a flatbread known to the Romans as panis focacius, to which toppings were then added. Modern pizza evolved from similar flatbread dishes in Naples, Italy, in the 18th or early 19th century.

The word pizza was first documented in AD 997 in Gaeta and successively in different parts of Central and Southern Italy. Pizza was mainly eaten in Italy and by emigrants from there. This changed after World War II when Allied troops stationed in Italy came to enjoy pizza along with other Italian foods.
Some commentators have suggested that the origins of modern pizza can be traced to pizzarelle, which were kosher for Passover cookies eaten by Roman Jews after returning from the synagogue on that holiday, though some also trace its origins to other Italian paschal bread. Other examples of flatbreads that survive to this day from the ancient Mediterranean world are focaccia (which may date back as far as the ancient Etruscans); Manakish in the Levant, coca (which has sweet and savory varieties) from Catalonia, Valencia and the Balearic Islands; the Greek Pita; Lepinja in the Balkans; or Piadina in the Romagna part of Emilia-Romagna in Italy