Canada's tariffs on US goods take effect, Trump threatens to ban planemaker Bombardier

Fact-check index: 62/100 — The core facts (tariff size, rate, Bombardier threat, bilateral trade relationship) are well-sourced, but the claim that 'both sides' are bracing for a standoff and the supply-chain risk analysis go beyond what the cited sources state.

• Canada's retaliatory tariffs on $20 billion of US goods took effect this week — Confirmed by Firstpost, Crain's Detroit, and BBC, all reporting the $20bn tariff package taking effect.
• Tariff rates reach 50% — Crain's Detroit headline: 'Canada imposes tariffs up to 50% on U.S.'
• Trump threatened to ban Bombardier from the US market — indexbox.io headline: 'Trump Threatens Bombardier Ban Amid Canada's Retaliatory Tariffs'.
• The two countries have long run the world's largest bilateral trading relationship — BBC: tariffs are 'jeopardising the stability of the world's largest bilateral trading relationship.'
• Both sides are bracing for a prolonged standoff — BBC headline/text describes only Canada as 'bracing for a prolonged trade war'; no source confirms the US side is similarly bracing, so 'both sides' overstates the sourcing.
• An open tariff war risks disrupting integrated supply chains (autos, aerospace, energy) well beyond North America — This broader risk analysis is not stated in any of the cited source snippets; appears to be the article's own editorial extrapolation without citation.