In a speech at the World Economic Forum in Switzerland on Wednesday, President Trump rebuked European allies and reasserted his ambitions to seize Greenland. Mr. Trump also distorted Greenland’s history, attacked the North Atlantic Treaty Organization and repeated familiar falsehoods on the economy and his own record. Here’s a fact-check. What Was Said “After the war, we gave Greenland back to Denmark. How stupid were we to do that? But we did it. But we gave it back.” This is misleading. Mr. Trump was most likely referring to a World War II-era defense pact between the United States and Denmark....