It's round and it's cut like a pie?

and the variety of ingredients.

https://en.wikipedia.org/wiki/Pie

Then it's a piece of Piza pizza pie.

With an "s". Been there. That leaning tower is well named. It is leaning! It's nearly 4° out of plumb!
When one sees it, it will amaze that it's stayed up for over 800 years!

...I thought you may have done it on purpose.
I just chimed in to talk about the leaning tower!

but slipped when typing.

He was asked if he wanted cut into four or eight pieces.

"Better make it four", he replied, "I don't think I could eat eight."

I call it an abomination...a corruption of all that is sweet, clean, and pure.

Pizza's journey in the United States began with Italian immigrants in New York. In what is now known as Little Italy, Gennaro Lombardi opened the first pizzeria in 1905. Made in the classic New York style using a coal oven and thin crust, Lombardi began the entire lineage of NYC pizza.Sep 15, 2021
==================================
lombardi's in New York City opened in 1905 and has been a family-run business ever since. Pizza was coined “pie” for its similarities to the dish, with its crust, circular shape, and sliced triangle portions that fit the description. By the 1900s, pizza became known as street food and the pie saw sales soar.

Pizza in Naples is very different than in Rome & Florence & what passes for pizza in Milan or Venice we would call pizza bread.
I've never been south of Naples so I don't know how it is down there.