FILE-- The Yangshan Port near Shanghai, China, May 27, 2019. China said on Aug. 23 that it would impose tariffs on $75 billion in American-made goods if President Donald Trump carries through on his promise to escalate his trade war with Beijing, in a sign that neither side is ready to back down from an economic conflict that has already cast a shadow over global growth prospects. (Lam Yik Fei/The New York Times)