When President Trump promised he’d be tough on trade, Canada wasn’t a name he threw around much. But his administration’s first big trade tax turns out to be a proposed 20 percent or so tariff on Canadian “soft lumber.” That’s pine, spruce, fir — the kind of wood used to build homes. Secretary of Commerce Wilbur Ross said this is not the start of a trade war with Canada. But it does feel to some like a warning shot.

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