Donald Trump’s imperialist designs on Greenland, Canada and Panama often sound like the ramblings of a chaos agent who views geopolitics and global trade like a real estate shark chasing new leads.

President-elect Donald Trump threatened the sovereignty of Panama, Greenland and Canada during a wide-ranging and often rambling press conference on Tuesday.

President-elect Trump refused to rule out military action to pursue his unprecedented vow to take Greenland and the Panama Canal -- plus absorb Canada. Why has he set his sights on expanding beyond the United States' borders?