Trade negotiations between the US and Canada broke down just before a midnight deadline, resulting in the US imposing 50% tariffs on approximately $20 billion worth of Canadian goods. Canadian Prime Minister Mark Carney announced that Canada would retaliate with reciprocal tariffs on US goods, matching the US levies "dollar for dollar" and setting a target implementation date of September 8th. The new US tariffs, applied using a Depression-era law, will affect about 5% of Canadian exports to the US, including wine, dairy, cement, clothing, and hockey equipment, adding to existing tariffs on steel, aluminum, autos, and lumber.

Prime Minister Carney cited "last-minute changes in the US proposed terms" as unfair and uneconomic, leading to the suspension of talks. While progress had been made, it was insufficient to meet Canada's objectives. Analysts noted that Canada likely sought more sector-specific relief than the US was willing to offer. The Canadian Chamber of Commerce, represented by Candace Laing, described the tariffs as a "body blow to North American competitiveness," warning of increased costs for American consumers and threats to Canadian businesses.

Economists estimate the new 50% tariffs could lead to the loss of 90,000 jobs in Canada and reduce the country's GDP by 0.3% to 0.6%. Canadian provinces like Ontario, Quebec, and British Columbia are expected to be particularly affected. Ontario Premier Doug Ford expressed full support for Carney's strong retaliatory response. Public opinion in Canada is divided, with 36% supporting retaliation and 30% preferring continued negotiation, indicating that the government will need to justify the economic pain of standing up to the US for a better long-term agreement.

Canada's retaliatory tariffs, also described as "dollar for dollar" by Carney, will be concentrated on US imports in sectors such as steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics. The ongoing dispute escalated what is already one of the world's most deeply integrated trading relationships, with Canada sending about 70% of its exports to the US. Both countries blamed each other for the collapse of talks, with the political fallout expected to be significant, potentially jeopardizing the future of the North American trade pact.