Reactions to U.S. President Donald Trump and his trade policies are notably different for each country and are evolving. A Pew survey shows that 59 percent of Canadians see the U.S. as the “greatest threat” to the Great White North. However, most Americans do not really think about Canada. EU leaders previously bristled at Mr. Trump’s demands that they spend more on defense and provide a better balance of trading terms. They also wanted to negotiate trade with Beijing rather than take Washington’s harsher view of the Middle Kingdom. The French are still pushing for strategic autonomy, and some U.S. analysts see America’s focus as permanently shifting toward Asia.    But Brussels has now rushed to comp...