U.S. President Donald Trump has ordered the process of renaming the iconic Lake Ontario “Lake America” as trade tensions between the United States and Canada continue to intensify.
Trump signed an executive order at the Oval Office on Thursday, August 27, directing the U.S. Department of the Interior to begin the process of changing the lake’s name. Under the order, the department has 30 days to update the name in the Geographic Names Information System (GNIS), the United States’ official database of geographic names.
The move would mean that “Lake America” could become the official name used by the U.S. government. It does not, however, require Canada or other countries to adopt the new name. The practical effect of the order is largely limited to official U.S. government usage.
Trump had been discussing the possibility of changing Lake Ontario’s name for some time. The issue has gained renewed attention amid deteriorating trade relations between Washington and Ottawa and a series of retaliatory tariffs imposed by the two countries.
Following the breakdown of recent trade negotiations, Washington imposed a 50 percent tariff on Canadian goods worth nearly $20 billion. Ottawa has announced plans to impose tariffs of the same magnitude in retaliation, with the measures expected to take effect next month.
Trump has repeatedly accused Canada of treating the United States unfairly in trade. He has maintained, however, that the decision to rename Lake Ontario was not directly intended as a measure against Canada.
Canadian Prime Minister Mark Carney has made Ottawa’s position clear, saying the lake has carried the name Lake Ontario for more than 400 years and that Canada will continue to use its traditional name.
Ontario Premier Doug Ford has also shown no willingness to accept the proposed change. He said Canadians, as well as people around the world, would continue to call the body of water Lake Ontario.
New York Governor Kathy Hochul has taken the same position, saying her state would not adopt the new name.
Lake Ontario is one of North America’s five Great Lakes. Canada’s province of Ontario lies to its north, while the U.S. state of New York borders it to the south. The lake’s name is deeply connected to Indigenous history and languages and predates the formation of the modern states of Canada and the United States.
Trump has previously pursued changes to U.S. geographic names. Shortly after beginning his second presidential term in 2025, he signed an executive order seeking to rename the Gulf of Mexico as the “Gulf of America.” Mexico and several other countries have not adopted the proposed name.
Experts say a similar situation could emerge over Lake Ontario. Although “Lake America” may enter official U.S. government usage, the international community is not obligated to abandon the traditional name. Canada and other countries could continue using “Lake Ontario” in their official documents and everyday usage.
Democratic lawmakers in the United States have also opposed Trump’s latest move. Michigan Representative Debbie Dingell said efforts would be made to introduce legislation in Congress aimed at reversing the decision.
Trump’s comments at the Oval Office also appeared to leave open the possibility of further geographic name changes. He indicated that he could consider changing the names of the Atlantic Ocean and the Pacific Ocean as well.
The Lake Ontario dispute therefore extends beyond the ongoing trade confrontation between Washington and Ottawa. It has opened a broader debate over historical identity, geographic naming conventions and the increasingly strained diplomatic relationship between the United States and Canada.