Even if they were born in Italy they are still American, but they are Italian immigrants. Ric Riccardo was a first generation Italian immigrant. Modern Chicago deep dish is likely a modified version of what he served in his pizzeria, but he did still invent it.
Italian immigrants came up with most of those different styles of pizza. You can hate them, but the people who invented them were Italian.
If they are born in America they are American.
Even if they were born in Italy they are still American, but they are Italian immigrants. Ric Riccardo was a first generation Italian immigrant. Modern Chicago deep dish is likely a modified version of what he served in his pizzeria, but he did still invent it.