At some point in his life, Donald Trump looked at a world map and saw something he wants--something that, as president of the U.S., he now says he will take "one way or the other." It's Greenland, an autonomous territory of Denmark, one of America's closest allies. "I love maps," Trump once explained. "And I always said: 'Look at the size of this. It's massive. That should be part of the United States.'"

And so an obsession began, one that is now turning into a spectacle somewhere between political farce and geopolitical crisis.

It's hardly the first time that the whims of cartography have shaped the worldviews of leaders and thus the arc of history. The geographer Mark Monmonier once........

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