For a large part of American history, it was widely believed that one could not be a good Catholic and a good American, as you would have to choose between loyalty to country and loyalty to the pope. Catholics play an important role in the American story - but we often make the mistake of seeing them as one, cohesive unit. In fact, Catholic immigrants from Ireland, Germany, Italy and other nations all had vastly different experiences that came to define what it means to be an American Catholic. Dr. Christopher Shannon explains how.