In the bars, hotels and windowless conference halls of the World Economic Forum in Davos, two themes dominated the conversation: America’s ascendancy and Europe’s decline. If the scale of the continent’s problems was unclear before politicians and chief executives descended on the Swiss ski resort, there was no ambiguity by the time Donald Trump had finished speaking. The 47th president of the US beamed via video into a packed conference hall to rail against stifling European regulation, car exports flooding to the US and fines and penalties on Apple, Google and Facebook. No longer will members of Nato be able