The base is bread. The pizza is defined as the base + cheese + tomato sauce + various toppings.
a dish of Italian origin, consisting of a flat round base of dough baked with a topping of tomatoes and cheese, typically with added meat, fish, or vegetables.
The base is bread. The pizza is defined as the base + cheese + tomato sauce + various toppings.
Source: the dictionary.
The base is not bread. Even your definition doesn’t call it bread. It’s pizza. And a random American dictionary is hardly a source.
Also, pizza is older than tomato in Europe…
Here’s an Italian dictionary, if talking with an Italian wasn’t enough
https://www.treccani.it/vocabolario/pizza/