Invade Greenland? Why?

Americans are trying to figure out President Trump's goals in Venezuela, but spare a thought this week for Greenland. The President has good strategic instincts about the world's largest island, so it's regrettable that his interest is devolving into a self-defeating exercise in U.S. bullying.

"We need Greenland," Mr. Trump said on Air Force One this weekend. "It's so strategic. Right now, Greenland is covered with Russian and Chinese ships all over the place. We need Greenland from the standpoint of national security."...