When the United States, the world’s biggest military power, decided that China, the second largest economic power, was a threat to its imperial dominance, two-thirds of US naval forces were transferred to Asia and the Pacific. This was the ‘pivot to Asia', announced by President Barack Obama in 2011. China, which in the space of a generation had risen from the chaos of Mao Zedong's ‘Cultural Revolution’ to an economic prosperity that has seen more than 500 million people lifted out of poverty, was suddenly the United States's new enemy.