Trump’s Lake Ontario Renaming Raises Legal and Diplomatic Questions

President Donald Trump issued an executive order on August 27, 2026, renaming Lake Ontario to "Lake America." The move comes amid escalating trade tensions with Canada. The administration claims all necessary notifications have been made, though Ontario Premier Doug Ford previously dismissed such suggestions as mere rhetoric.

This is not the first time the administration has attempted to rename a geographical feature. In 2025, an executive order renamed the Gulf of Mexico to the Gulf of America and restored Alaska's Denali to its original name, Mount McKinley. These actions follow a formal process, though the renaming of bodies of water outside U.S. territorial waters presents unique challenges.

In the United States, place names are standardized by the U.S. Board on Geographic Names, part of the U.S. Geological Survey. The process typically begins locally, with state or county proposals gathering support before moving through state and federal channels. For example, in 2018, Minnesota renamed a large lake in Minneapolis to Bde Maka Ska after a Dakota name. The request moved from the Minneapolis Park Board to county commissioners, then the Minnesota Department of Natural Resources, and finally the Board on Geographic Names.

The renaming of Denali from Mount McKinley took decades. Alaska first requested the change in 1975, but objections from Ohio's congressional delegation delayed it. President Barack Obama eventually enacted the change in 2015 through the Department of the Interior, citing the mountain's sacred significance to Alaska Natives.

Disputes over name changes can lead to legal challenges. In the case of Bde Maka Ska, opponents sued the state natural resources agency, but the Minnesota Supreme Court upheld the change.

Renaming bodies of water outside U.S. territorial waters, like the Gulf of Mexico, poses different challenges. The Board on Geographic Names may approve the change for U.S. maps, but there is no international authority overseeing place names. Each country decides its own naming conventions, and the U.S. has no official means to compel other nations to adopt its preferred names. However, the U.S. could formally request changes or impose sanctions on non-compliant countries.

Once a name change is approved, U.S. government documents, signage, and maps reflect the new name. Widely used online mapping services, such as Google Maps, display place names based on the viewer's location. For instance, users in the U.S. may see the Gulf of America, while users in Mexico see the Gulf of Mexico. Mapping companies often adjust display settings based on the viewer's location or allow manual adjustments to reflect different geographical perspectives.

This updated report was first published on January 24, 2025.