CLAREMONT, CALIFORNIA — “Decoupling” is central to the geopolitical duel between the United States and China. Conceived and promoted by hawks in U.S. President Donald Trump’s administration, this strategy has now become America’s principal tool to weaken Chinese power. The first act of decoupling — the Sino-American trade war that began in 2018 — has substantially reduced bilateral trade. A similar process is now in full swing in the technology sector, with t