Stefansson’s map revived the memory of the Norse voyages to the Americas in 1000, which raise many of the same challenges posed by globalization today. What happens if weapons technology is unequal and hostilities break out? What are the consequences of trade imbalances? If one side has more people, what can the other side do to compensate? And, finally, why is it so difficult to learn from the other side, even if it has mastered a demonstrably useful skill?
