Taiwanese and Hong Kong media reported on Aug. 27 that the U.S. government signed an executive order changing the official domestic name of Lake Ontario to Lake America. President Trump had said on his social platform on Aug. 25 that he was considering the change.

The order governs how the lake is labeled on maps and in documents produced by U.S. federal agencies. Internationally used names follow the conventions of the countries concerned and of international bodies, so Canadian and third-country usage does not change automatically.

An extension of the trade fight

The move follows the breakdown of U.S.-Canada trade talks last week. Washington has imposed 50% tariffs on roughly $20 billion of Canadian goods, and Ottawa has announced matching retaliation.

Explaining the renaming, Trump suggested the United States expects little future business with Ontario. Canadian opinion responded with derision, and the Ontario provincial government said place names are not a bargaining chip.

Precedent

In January 2025 the United States issued an order directing federal use of 'Gulf of America' for the Gulf of Mexico. States may set their own domestic usage, but where counterparts and international organizations do not follow, the effect stays confined to domestic documents.

Mapping services have responded by displaying different labels by country. The same is likely here, with the name shown depending on where a user connects from.

The practical questions the lakes raise

The Great Lakes are a shared water resource. Water quality, navigation and fisheries have been coordinated through binational commission machinery, and that structure continues independently of the naming dispute.

Whether the argument over names affects working-level cooperation is not yet established. This paper will follow both governments' announcements and international usage.