I live in the Midwest. In the Chicagoland area pizzas are rarely cut like that. They are mostly cut into squares, it's the Quad-City style. And any Chicago style deep-dish pizza wouldn't be able to be folded, let alone picked up with bare hands.
If I'm going to fold pizza, I may as well order a taco with cheese and pepperoni, or even a gyro and fill the pita bread with pizza flavors.