In a few short months, President Donald Trump has upended the $24 trillion market for global merchandise trade. In a dizzying series of announcements, he’s slapped hefty tariffs on free-trade deal partners like Canada and Mexico as well as economic rivals like China,

Trade retaliation looms from Canada, China, Mexico, and the European Union in response to U.S. tariffs. Four timelines lay out their responses, and the experience of American soybean farmers in 2018