President-elect Donald J. Trump has made headlines in recent days after making statements at a Mar-a-Lago press conference that he wanted the U.S. to buy Greenland from Denmark, and if the Danish weren’t willing to accept a deal he wouldn’t rule out the use of military force to take the island.But despite all of the associated media hysteria around Trump’s plan, what are the actual national security implications associated with Greenland, and what is America’s history of trying to buy it?