This choice comes to mind when I think about the 47th president's frequent comments recently about incorporating Greenland and Canada into the United States. A few cases in point: Before delivering an inaugural address in which he vaguely but forcefully expressed a desire for the U.S. to expand its territory, Trump raised the issue on a confrontational phone call with the prime minister of Denmark, which handles Greenland's international affairs. More recently, he spoke of Canada becoming a U.S. state to reporters on Air Force One. But as an economic historian, I believe that thought experiments can be a useful way of understanding truths about the world. And one such truth is that Greenland and Canada play a key role in the global economy. If the U.S. were to absorb either or both, it would be a strategic, economic and political game changer. So, for a moment, let's take Trump both seriously and literally. Below, I've laid out some very rough measures of how a reconstituted...
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