WASHINGTON — The United States Postal Service on Friday stopped accepting all mail to Canada on the expectation that the labour dispute between Canada Post and its workers will last at least into next week. In a statement, the USPS said it would “suspend accepting mail destined to Canada” starting Saturday at 11:59 central daylight time. “As a convenience to our customers and to minimize service disruptions, we arranged to accept mail destined for Canada as long as possible,” Giselle Valero, a USPS vice president, said in the statement. “We will continue to closely monitor the strike situation, and once...