Canada began implementing retaliatory tariffs on hundreds of U.S. products early Tuesday, a move that intensifies a trade war between the two nations and risks further escalation from President Donald Trump.

The tariffs, some as high as 50%, target goods such as aluminum foil, raincoats, and cheese. U.S. officials from states bordering Canada have expressed concern that the trade dispute will negatively impact local businesses and consumers.

Canadian officials stated the retaliatory tariffs would apply to approximately $20 billion worth of U.S. products, matching the value of recent U.S. levies. This figure represents nearly 6% of annual U.S. exports to Canada, based on 2025 U.S. Census Bureau data.

The trade conflict began last month after negotiations collapsed, leading to a new round of U.S. tariffs. Canada subsequently announced matching tariffs, scheduled to commence in the second week of September.

President Trump has previously indicated a strong response if Canadian tariffs were enacted. He has threatened to increase tariffs on Canadian-made cars and auto parts from 25% to 50% starting in January.

In late August, Trump signed an executive order renaming Lake Ontario to "Lake America." He later posted an AI-generated video on social media depicting birds with his signature hairstyle marching with firearms to protect a body of water labeled "Lake America." Canada has stated it will continue to refer to the lake as "Lake Ontario."

Canadian Prime Minister Mark Carney criticized the Trump administration's approach, suggesting that U.S. public statements indicated a lack of willingness to negotiate a resolution. Carney stated, "When the Americans stop doing memes, stop throwing shade and stop trying to be tough, and start being serious about having those discussions, we can have those discussions."

In the first half of 2026, Canada was the second-largest export market for U.S. goods, with $175.8 billion in exports, accounting for 14% of all U.S. exports. Mexico was the largest market. A professor studying commodity markets described the situation as a "classic trade-war situation" where retaliatory tariffs can lead to a "really bad equilibrium."