After taking charge of building the canal in the early 20th century, the US turned full control over to Panama in the 1970s via a treaty. But this week, Trump said that if the "rip off" did not stop, he would demand the canal be returned to the US – though he did not specify how.

The president-elect is renewing calls he made during his first term for the U.S. to buy Greenland, the ice-covered semi-autonomous Danish territory, and mostly Inuit