U.S. President Donald Trump signed an executive order to rename Lake Ontario as Lake America while the United States imposed 50 percent tariffs on $20 billion of Canadian goods, escalating the bilateral trade dispute and prompting immediate Canadian counter‑measures.
Trump signed the order at the Resolute Desk on August 27 2026, displaying a map that labeled Lake Ontario “Lake America” in red letters; the directive tells the Interior Department to revise the U.S. geographic naming system, with the change to take effect immediately and be completed within 30 days.
Canadian Prime Minister Mark Carney rejected the renaming, asserting that Lake Ontario’s name derives from the Huron word “oniatarí:io” and must remain unchanged; Ottawa responded to the U.S. tariffs with matching duties on $20 billion of American steel, dairy, appliances and farm equipment, intensifying the trade standoff.
While the White House says the order is official and effective immediately, officials note that the United States cannot compel Canada to adopt the new name, and no international authority governs shared water names, leaving the dispute unresolved.