When Donald Trump and Xi Jinping emerged from their "historic" talks in Busan , South Korea on Friday, there were enough wins for both sides to claim success.

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China had "paused" its restrictions on rare earth exports and agreed to buy American soybeans while America had wound back punitive tariffs.

But what about the underlying forces driving these frictions, the defining great power rivalry of the 21 st century? Who has emerged with the greater leverage for the inevitable contests to come?

Was it the world's apex military power, builder o

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