BUENOS AIRES – The U.S. agreed to suspend a scheduled escalation of tariffs on $200 billion in Chinese goods, which were set to boost from 10 percent to 25 percent on Jan. 1, according to a White House statement released after President Trump and Chinese President Xi Jinping met on sidelines of the G20 on Saturday. In return, the Chinese have agreed to purchase “a not yet agreed upon, but very substantial, amount of agricultural, energy, industrial, and other product”...