US President Donald Trump issued an executive order telling the Interior Department to replace Lake Ontario with “Lake America” in the federal geographic naming system. The action governs terminology used by the United States government but cannot require Canada, independent mapmakers or other countries to follow the change for the shared Great Lake.
Trump presented the order in the Oval Office beside a regional map bearing the new label. Although he described the decision as immediately official, the text gives the government 30 days to carry out the required updates. The directive covers federal maps, records and databases, giving the administration broad control over domestic government usage without settling the lake’s name internationally. No single global authority has exclusive power to name waters shared by countries.
The decision arrived during a sharp deterioration in relations between Washington and Ottawa. Trade negotiations had broken down before the United States imposed 50% duties on $20 billion in Canadian products. Canada answered with tariffs on an equivalent value of American exports, including dairy products, appliances, farm equipment and steel. Trump linked his criticism of Canada to trade and defence, while saying the naming order was not intended to convey a specific geopolitical message.
Canadian Prime Minister Mark Carney rejected the designation and emphasized the name’s Indigenous origin and long history. Lake Ontario derives its name from a Huron word rendered as “oniatarí:io,” meaning “lake of shining waters,” and the province later took its own name from the lake. Ontario Premier Doug Ford and Nova Scotia Premier Tim Houston also insisted that Canadians would continue using Lake Ontario.
Resistance was not confined to Canada. New York Governor Kathy Hochul said her state, which borders the lake, would not adopt Trump’s preferred term. Michigan Governor Gretchen Whitmer invoked the familiar school mnemonic for the five Great Lakes, while Wisconsin Governor Tony Evers mocked the order with a video purporting to rename Lake Michigan on a restaurant napkin.
No single global authority has exclusive power to name waters shared by countries. The lake is one of several Great Lakes crossing the US-Canada boundary, so official documents may now use different labels for the same water depending on which national government produces them.
The step echoes Trump’s earlier decision to have US agencies call the Gulf of Mexico the “Gulf of America”. At the signing, he suggested that the Atlantic or Pacific could someday become another target for a new name. Whatever terminology Washington adopts, the order does not alter Canada’s jurisdiction or create a binding name for the lake beyond US federal practice.
