President Donald Trump signed an executive order renaming Lake Ontario to Lake America, effective immediately, as trade tensions with Canada escalated. The move follows the U.S. imposition of 50% tariffs on $20 billion of Canadian goods and Canada’s planned retaliatory duties. The renaming adds a symbolic front to the ongoing U.S.‑Canada trade dispute.
The order directs the U.S. Department of the Interior to update the Geographic Names Information Service within 30 days, while Canadian Prime Minister Mark Carney rejected the change, stating the lake has been called Lake Ontario for over 400 years by Indigenous peoples and will remain so. Trump cited the earlier Gulf of America renaming as precedent.
The renaming has no immediate legal effect on international waters, but it reinforces U.S. assertions over shared hydronyms and may complicate cross‑border data systems such as mapping services. Google Maps already shows divergent names for the Gulf of America, foreshadowing similar splits for the lake.
Canada disputes the U.S. authority to rename shared bodies of water, arguing that a single nation cannot unilaterally alter internationally recognized names. The conflict echoes the earlier Gulf of Mexico dispute, where Mexico and Google maintain separate naming conventions.