Why does Trump want to buy Greenland?

So, Donald Trump wants to expand the United States - in a big way. But why is he considering seizing Greenland, of all places - and by military force, no less? And why does he want to reclaim the Panama Canal, and absorb Canada?Trump’s comments aren’t just, as one commentator put it, “untethered from international law”. They’ve also angered many world leaders. And made others laugh. One president responded with a troll of her own.Today, North America correspondent Farrah Tomazin, on what this all means, for the next four years. And what the history of American domination over other parts of the globe can teach us.Subscribe to The Age & SMH: https://subscribe.smh.com.au/See omnystudio.com/listener for privacy information.