U.S. President Donald Trump has suggested renaming Lake Ontario to "Lake America" in a post on Truth Social, as part of his trade war with Canada. Trump can potentially do this through executive order, having previously renamed the Gulf of Mexico and Denali through similar actions. The U.S. Board on Geographic Names is responsible for making such changes, which would affect international cartography standards and create naming inconsistencies between the US and Canada. The move could also conflict with UN agreements promoting national and international standardization of geographical names.
Written by the local model on 2026-08-26,
using this article's own text rather than the other coverage of the
same event (that is the story summary below).
The Great Lakes mostly have anglicized Indigenous names — Ontario, Huron, Michigan and Erie — and one anglicized French name, Superior.
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Lakes → have → names
But if U.S. President Donald Trump follows through on his latest threat amid the trade war, the smallest of those lakes could soon have an anglicized Italian name instead, “Lake America,” named directly for the United States of America, which in turn takes its name from Amerigo Vespucci, the 16th century Italian explorer.
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which → follow → Vespucci
“The United States is giving serious consideration to changing the name of Lake Ontario to Lake America in that we don’t expect to doing much business with Ontario any longer,” Trump posted on Truth Social on Tuesday.
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Trump → give → Tuesday
The National Post explains the diplomatic and legal boundaries of Great Lakes nomenclature, and why they won’t do much to stop a determined president.
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they → explain → president
Can Trump do this?
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Trump → do → this
He’s the president, and as such can make executive orders regarding the naming practices of federally regulated entities in the United States, such as the Coast Guard, and, more to the point, the U.S. Board on Geographic Names, and its Domestic Names Committee, which is part of the Department of the Interior.
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which → ’ → Interior
Trump has done this sort of thing before, as in Executive Order 14172, known as “Restoring Names That Honor American Greatness,” which was passed on the day of his second inauguration last year.
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which → do → inauguration
That’s the one that ordered the Gulf of Mexico be referred to as Gulf of America, and indeed Google Maps today lists it as “Gulf of Mexico (Gulf of America).”
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Maps → ’ → America
It also officially renamed Denali, the mountain in Alaska, as Mount McKinley.
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It → rename → McKinley
However, it is contrary to treaties and agreements the United States claims to abide by.
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States → claim → treaties
Are there multilateral reasons he should not do this?
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he → do → this
At the United Nations (headquartered in New York City, the settlement originally known as New Amsterdam), the Group of Experts on Geographical Names (UNGEGN) “supports the national and international standardization of geographical names… (by) promoting the use of standardized geographical names.”
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Group → headquarter → names
So right off the bat, unilaterally changing the name of Lake Ontario to Lake America would not only put state authorities of New York in a quandary over whether to follow the federal lead, it would also raise a standardization problem between Canada and the U.S.
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it → change → Canada
In a conference report from 1972, this United Nations group contemplates the problem of competing names arising when countries do not share a language, and that if they “do not succeed in agreeing on a common name form, it should be a general rule of international cartography that the name forms of each of the languages in question should be accepted.”
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forms → contemplate → question
It says nothing, however, about deliberate renaming of shared lakes as an act of economic belligerence.
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It → say → belligerence
What about bilateral reasons he should not do this?
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he → do → this
In Appendix C to the 2016 version of “principles, policies and procedures” for the U.S. Board on Geographic Names, “Treatment of Names of Geographical Features Shared by the United States and Canada,” it says “the coordination in the naming of geographic entities on or across the United States-Canada boundary is of mutual benefit to the names authorities in both countries, and to mapping and surveying agencies.”
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coordination → share → agencies
It also says retaining existing names “is highly desirable,” and that if a change is proposed for “strong specific reasons,” it should be “considered by the appropriate names authorities in both countries.”
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it → say → countries
Supposing he does it anyway.
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he → suppose → it
Do other countries have to use names imposed like this?
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countries → have → this
The French call the English Channel “La Manche.”
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French → call → Channel
More controversially, various countries have various names for the contested Spratly Islands in the South China Sea.
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countries → have → Sea
Canada and the United States have more than a century of peaceful cooperation on sharing the Great Lakes under the 1909 Boundary Waters Treaty,
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Canada → have → Treaty
under the terms of which the countries created the International Joint Commission to manage the Great Lakes, whatever they are called.
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they → create → Lakes
