North American trade deal at risk as U.S., Canada exchange barbs

The trade pact that binds North America is quietly under the most strain since its inception, risking a break in one of the world's most integrated manufacturing economies.Why it matters: A joint review of the signature Trump 1.0 trade agreement — the U.S.-Mexico-Canada Agreement, itself an update of the North American Free Trade Agreement — was expected to be a technical exercise. Instead, a war of words between U.S. and Canadian officials is pushing the deal to a potential breaking point.State...