DONALD TRUMP took North America to the precipice of a trade war over the weekend. On February third he cooled issues down, delaying tariffs on Canada and Mexico by a month because the nations try to achieve a deal which will contain the whole lot from immigration controls to commerce issues. The sudden about-turn underscored Mr Trump’s repute as an agent of chaos who makes use of excessive threats to wrest concessions out of others. It’s a harmful sport that may simply as simply result in miscalculations and corrosive uncertainty for the worldwide economic system.