On September 29, local time, according to US media reports, the US officially implemented an import ban on some Canadian products in the early morning of the same day, involving about 967 million US dollars of Canadian exports to the US. The specific categories include alcohol, dairy products, and motorcycles. American public opinion pointed out that this may lead to further retaliation from Canada. Trade negotiations between Canada and the US broke down in late August. The US imposed 50% tariffs on Canadian goods worth 20 billion US dollars. On September 8, Canada imposed equal countervailing tariffs on US goods such as steel, dairy products, agricultural equipment, pulp, and electronic products, involving about 20 billion US dollars of US goods, with tax rates ranging from 15% to 50%. In response, the US side announced on the same day that it will impose 50% tariffs on more Canadian products starting September 15, prohibiting some Canadian products from entering the US market from September 29, and excluding Canadian products from the US government's procurement plan.

On September 29, local time, according to US media reports, the US officially implemented an import ban on some Canadian products in the early morning of the same day, involving about 967 million US dollars of Canadian exports to the US. The specific categories include alcohol, dairy products, and motorcycles. American public opinion pointed out that this may lead to further retaliation from Canada. Trade negotiations between Canada and the US broke down in late August. The US imposed 50% tariffs on Canadian goods worth 20 billion US dollars. On September 8, Canada imposed equal countervailing tariffs on US goods such as steel, dairy products, agricultural equipment, pulp, and electronic products, involving about 20 billion US dollars of US goods, with tax rates ranging from 15% to 50%. In response, the US side announced on the same day that it will impose 50% tariffs on more Canadian products starting September 15, prohibiting some Canadian products from entering the US market from September 29, and excluding Canadian products from the US government's procurement plan.