I am a pizza lover myself, so I've always wanted to go to New York to try an actual New York slice.
Oh man me too, my favorite resturaunt is Pizza by the slice, I like that I can grab a prepared single slice and walk around whenever I want.
It sounds so good, there's something about New York pizza that people can't get enough of so it must be great.
Yeah it's been popular forever, in Roman culture they ate focaccia which is basically just a flat bread, not nearly as good without the toppings!
I've heard that too, when did they start adding toppings then?
Around the same time, with toppings it's known as the Panis Foccacia, Italians still use that bread today. 
What type of toppings did they initially start putting onto them?
Things like olives and cured meats. Modern pizza as we eat it today was created in Naples Italy in the 18th century.