Michael Beckley is associate professor of political science at Tufts University and a non-resident senior fellow at the American Enterprise Institute.

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It has become conventional wisdom that America and China are running a "superpower marathon" that may last a century. Yet Hal Brands and Michael Beckley pose a counterintuitive question: What if the sharpest phase of that competition is more like a decade-long sprint?

The Sino-American contest is driven by clashing geopolitical interests and a stark ideological dispute over whether authoritarianism or democracy will dominate the 21st century. But both history and China's current trajectory suggest that this rivalry will reach its moment of maximum danger in the 2020s.

China is at a perilous moment: strong enough to violently challenge the existing order, yet losing confidence that time is on its side. Numerous examples from antiquity to the present show that rising powers become most aggressive when their fortunes fade, their difficulties multiply and they realise they must achieve their ambitions now or miss the chance to do so forever. China has already started down this path. Witness its aggression toward Taiwan, its record-breaking military buildup and its efforts to dominate the critical technologies that will shape the world's future.

Over the long run, the Chinese challenge will most likely prove more manageable than many pessimists currently believe-but during the 2020s, the pace of Sino-American conflict will accelerate, and the prospect of war will be frighteningly real. America, Brands and Beckley argue, will still need a sustainable approach to winning a protracted global competition. But first, it needs a near-term strategy for navigating the danger zone ahead.