Not so casually the only actual pizza in the list is the one that is called pizza (pizza al taglio[1]) all the others are different specialities that may (or may not) be overall similar to a pizza.
In Italy there are tens or hundreds of regional variations of "focaccie" (that are not pizza) or similar "bread with something", the traditional diets all revolve around bread or pasta (i.e. flour+water), (olive) oil, vegetables and cheese, i.e. the most economical ingredients, more or less always the same and people had centuries to invent variations on the same theme.
[1] which is common enough, literally "pizza for cut", it is actually a "normal" pizza cooked in largish rectangular pans that is sold in rectangular slices.