Nuuk, a city of no more than 20,000 people, is serviced by one of very few runways in a wilderness more than three times the size of Texas. Finn was born there, to a Danish father and an Inuit mother. “You must know,” he told me—after we’d sat for an hour or so over tea and salted musk ox, and he had come to trust that I was not one of the “other” Americans—“that I will defend my home.”