What we know about why Canada’s trade deal with America fell apart

In remark on Monday, Prime Minister Mark Carney alluded to the shifting rationale for tariffs from the U.S. side, “from fentanyl to taxes on U.S. tech giants, to certification of U.S. aircraft, to the sharing of tolls of a bridge that Canada built and paid for, to our dairy policy, to provincial decisions not to sell American alcohol during a trade war, to a television advertisement that quoted Ronald Reagan, to smoke from wildfires, while they threatened our communities.”