Authentic pizza is just bread, olive oil and cheese. And since that's clearly not pizza, pizza isn't real.
/S
Chicago style pizza is just one dish named pizza created by Italian immigrants. Italians from New York don't have a monopoly on the term, and neither to Italians who never left.
I was discussing what constitutes pizza with a friend one time (the whole "is pizza just an open faced sandwich?" type conversation) and he said something I found to be astute and beautiful.
"Pizza is like love, it is hard to define, but you will know it when you have it"