Among the Chinese-made products exempted from the latest round of U.S. tariffs -- designed to cover nearly all remaining imports -- is one of the most visible symbols of global trade, and a crucial piece of the system that delivers so many items not exempted: the shipping container. The Office of the U.S. Trade Representative last week determined that shipping containers, including some repurposed for the Pentagon, would be among the products exempted from a new round of Section 301...