British Prime Minister Boris Johnson campaigned on one theme alone — “Get Brexit done” — and if the results of an exit poll projection are correct, that just may happen. The U.K. exit poll predicts that Johnson's Conservatives won a substantial victory Thursday night in the country's general election. But even if Johnson pulls Britain out of the European Union by the Jan. 31 deadline, he will still face the mountainous challenge of negotiating a complex trade deal with the EU by the end of next year — a task that many experts say is not possible.
