Moments after President Donald Trump’s 10 percent tariffs on China took effect, Beijing retaliated by announcing a 15 percent tax on U.S. coal and liquefied natural gas and a 10 percent tax on crude oil, farm equipment, and some vehicles. The tariffs on U.S. exports will take effect on February 10. Trump imposed the across-the-board tariffs on Chinese goods to punish Xi Jinping for not helping to stop the flow of fentanyl into the U.S. “China hopefully is going to stop sending...