While experts say some manufacturing could shift back to the U.S., retaliatory tariffs could dry up the Canadian market for Maine timber. But many unknowns remain.

At the U.S. Embassy in Ottawa, a quote from former President Ronald Reagan is engraved on one wall. “Let the 5,000-mile border between Canada and the United States stand as a symbol for the future," Reagan said upon signing a 1988 free trade pact with America’s northern neighbor.

A storm tracking in from northwestern Canada will dive toward the Great Lakes Friday and then swing across the St. Lawrence Valley this weekend, producing a swath of heavy snow in an area that has been hit with major snowfalls in the past month,