Prof. Bassani, there was a mass demonstration in Barcelona on Friday. Hundreds of thousands took to the streets to proclaim their desire for independence. Why, with all the crises in Europe—Syrian migrants, EU economic woes, and the Greek bailout, to name just two—are people in northern Spain agitating for independence? First of all, it is not people in northern Spain, it is the Catalans that are making a bid for their own independence from Spain. Now, the Catalans are not easily defined as a specific ethnic group, as half of the people in Barcelona do not even have Catalan parents,...