Canada announced retaliatory tariffs of up to 50 percent on hundreds of American products, effective September 8, escalating a trade war with the Trump administration. The new levies target items ranging from aluminum foil and dishwashers to steel, aluminum, and fish, affecting approximately $20 billion in U.S. imports. Prime Minister Mark Carney authorized the measures to protect Canadian workers and manufacturers harmed by U.S. tariffs, though he acknowledged the move would raise costs for Canadian consumers.

The tariff list mirrors U.S. measures on Canadian exports, specifically targeting clothing, forestry products, and tools. Canada will maintain a 25 percent tariff on American-made cars while allowing limited tariff-free imports. In response, President Trump threatened to double auto tariffs to 50 percent, potentially threatening Canadian car plants that export over 90 percent of production.

Economists warn Canada's economy, roughly one-twelfth the size of the U.S., renders its tariffs largely ineffective. Despite this, public opinion polls show widespread Canadian support for retaliation, though provincial leaders like Alberta's Danielle Smith have urged restraint. The Trump administration's tariffs exclude oil, natural gas, potash, and many minerals.