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US STOCKS-Wall St slides as U.S.-China trade war escalates


* US proposes fresh tariffs on $200 bln worth of China goods * Boeing, Caterpillar fall more than 1 pct * Tech shares slide, chipmakers lead losses * Indexes down: Dow 0.57 pct, S&P 0.42 pct, Nasdaq 0.29 pct (Updates to open) July 11 (Reuters) - U.S stocks slid on Wednesday amid a broad selloff on escalating