How long can a country that represents less than 5 per cent of the world’s population and 22 per cent of the global economy, remain the world’s dominant military and
political power? That question is being asked with increasing urgency in the Middle East, eastern Europe and the Pacific Ocean.
Since the cold war ended, the overwhelming power of the US military has been the central fact of global politics. Now, in three crucial regions, that power is being tested — as America’s rivals test its resolve and the US considers when and whether to push back.
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