China on Tuesday imposed 15 percent tariffs on U.S. coal and liquefied natural gas and a 10 percent tariff on crude oil, agricultural machinery, cars and pickup trucks, set up export controls on more critical minerals, added two U.S. companies to its unreliable entities list and launched an antimonopoly investigation into Google -- all as new U.S. tariffs on Chinese goods took effect. President Trump on Saturday announced he would impose a 10 percent tariff on China along with 25...