They also forget the potato, which had such a denser calorie to acre ratio it revolutionized European society. Those of us who understand how the potato led to the tragedy of the Irish potato famine can forget how it enabled population explosions in Europe that dramatically changed the face of the continent.

And that’s just one example of how the cultures of the Americas interacted with European culture to create something entirely new.

Santorum has no idea what he’s talking about.