What's Behind Trump's Expansionist Rhetoric?

First, President-elect Donald Trump tweaked Canada’s far-left Prime Minister Justin Trudeau about becoming governor of the 51st state of the United States of America. Then he said that the Panama Canal should once again come under American control. Make that the 52nd state. And now, are you ready for a 53rd state? On Sunday, Trump renewed a call he made during his first term: that the United States should buy Greenland from Denmark. Could the man possibly be serious?