China and the United States have been engaged in a bruising trade war for years. This infographic highlights the little-known but vital role pigs played in helping President Trump win the trade war. African Swine Fever decimated about half of the domestic Chinese hog herd, leading pork prices to double. That, in turn, prevented China from excessively easing monetary policy for fear of stoking inflation. Instead it forced China to remove tariffs on US pork exports, yielding President Donald J. Trump the victory.