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President Donald Trump has ordered the federal government to rename Lake Ontario as “Lake America.” The Trump Lake America order repeats a naming strategy that drew broad public opposition when applied to the Gulf of Mexico.
Trump signed the executive order Thursday, Aug. 27. The decision comes amid a rapidly escalating trade dispute between the United States and Canada.
What the Trump Lake America Order Changes
The order directs the Interior Department and U.S. Board on Geographic Names to complete the change within 30 days. Federal maps, documents, contracts and communications must then use “Lake America.”
However, the order only governs U.S. federal usage. It does not require Canada, international organizations or private mapmakers to adopt the name.
Lake Ontario borders New York and the Canadian province of Ontario. Four of the five Great Lakes cross the U.S.-Canada border.
The White House order describes the lake as a critical economic resource. It points to shipping, energy, tourism and drinking water as reasons for highlighting its importance to the United States.
Canada Rejects the New Name
Canadian Prime Minister Mark Carney rejected the change. He noted that Ontario comes from an Indigenous word and predates both the United States and Canadian Confederation.
The naming dispute follows the collapse of recent trade negotiations. The United States imposed 50% tariffs on $27.6 billion in Canadian goods beginning Aug. 22.
Canada plans to answer with matching tariffs on U.S. products starting Sept. 8. The affected industries include steel, dairy, appliances, agricultural equipment, electronics, pulp and paper.
Canada’s government said the countermeasures would match the American tariffs “dollar for dollar” and “rate for rate.” The complete announcement is available through the Canadian Department of Finance.
The Gulf of America Precedent
The Lake Ontario decision closely resembles Trump’s 2025 order renaming the Gulf of Mexico as the “Gulf of America” for federal use.
That earlier change took effect on U.S. government maps. Some technology companies also updated the name for American users. Mexico and other countries continued using Gulf of Mexico.
Public polling found little support for Trump’s first geographic rebranding effort. A February 2025 Marquette Law School Poll found that 71% of American adults opposed renaming the Gulf. Only 29% supported it.
The survey questioned 1,018 adults nationwide and had a margin of error of 3.5 percentage points. Among several early Trump policies included in the poll, the Gulf name change received the highest opposition.
A separate Reuters/Ipsos survey produced similar results. It found 70% opposed the Gulf change, while 25% supported it.
Symbolic Move Carries Political Risks
No major national poll has yet measured public opinion about “Lake America.” Still, the earlier Gulf polling shows the political challenge facing another unilateral name change.
The order also shifts attention toward a symbolic dispute as tariffs threaten businesses and consumers in both countries. Canada and the United States maintain deeply connected supply chains in agriculture, manufacturing, energy and automobiles.
For communities affected by higher import costs, the lasting consequences may come from the trade dispute rather than the lake’s federal label. Businesses and consumers should monitor tariff developments as both governments prepare their next steps.