A decade after Wilbur Ross used a tariff on imported steel to weather Chinese competition and make his American mills profitable, he hung a picture taken in Beijing on his office wall. It shows a poster of three women in military uniforms marching proudly through Tiananmen Square, a platoon of People’s Liberation Army soldiers behind them. The picture followed a pair of Qing dynasty guard dog statues that Ross had stationed at the headquarters of his investment firm in New York and six sculptures of Coca-Cola bottles rendered in white-and-blue Ming porcelain displayed in the dining room at his waterfront villa in Palm Beach.