A new White House policy document formalizes President Trump’s long-held contempt for Europe’s leaders. It made clear that the continent now stands at a strategic crossroads.The Trump administration has not exactly kept its low regard for Europe secret. President Trump has long portrayed European allies as freeloaders that fail to pay enough for their own security and argued that the European Union was “formed to screw the United States.”Now, that hostility is official White House policy.The Trump administration issued a national security strategy paper this week that called for European nations to take “primary responsibility” for their own defense, indicating...