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President Trump’s two-day summit last week with Chinese President Xi Jinping—his first trip to China since 2017—included all sorts of agenda items: the Strait of Hormuz, the future of Taiwan, global trade, etcetera. But like everything else these days, the real focus came down to artificial intelligence, which has served as the central battleground of the increasingly tense cold war between the two countries. From Pennsylvania Avenue to Sand Hill Road, the binary race for A.I. supremacy has become the existential national-security justification for the White House’s broadly anything-goes regulatory posture.