"Sometimes history jumps. Think of the first world war, the Bolshevik revolution, the Great Depression, the election of Adolf Hitler, the second world war,... We may be on the brink of an event as transformative as many of these: the election of Donald Trump as US president. This would mark the end of a US-led west as the central force in global affairs. The result would not be a new order. It would be perilous disorder."