What drives the United States’ bold geopolitical ambitions toward Greenland and Canada? It boils down to economic and national security.

The president has repeatedly discussed his desire to "retake" the Panama Canal and take possession of Greenland.

President Donald Trump's threats to impose punishing tariffs on Canada and Mexico may be part of a strategy to gain leverage ahead of new negotiations on a regional trade agreement, experts said.

While much about the threatened tariffs is still unclear, experts predict they would be bad news for all three economies, with few winners.

Trump underscored his intention to use tariffs as a tool of international economic policy and an increasingly vital source of government revenue.