Canadian Prime Minister Mark Carney will meet with President Trump in the Oval Office on Tuesday at a time when one of the world’s most durable and amicable alliances has been fractured by Trump’s trade war and annexation threats. Carney’s second visit to the White House comes ahead of a review next year of the free trade agreement, which is critical to Canada’s economy. More than 77% of Canada’s exports go to the U.S. Trump’s talk of making Canada the 51st state and his tariffs have Canadians