President Donald Trump announced Tuesday that the United States is “giving serious consideration” to renaming Lake Ontario to “Lake America” as his trade war with Canada intensifies over tariffs and trade negotiations.
Trump posted on social media that the U.S. does not expect to continue doing much business with Ontario, citing the escalating dispute. The statement came after trade talks between the two countries collapsed last week, with Trump imposing tariffs on Canadian goods and both nations swapping retaliatory measures.
Lake Ontario is one of the five Great Lakes and forms the international boundary between New York and Ontario. The lake is a shared resource jointly managed by the United States and Canada through the International Joint Commission and the Great Lakes Water Quality Agreement, both established under the 1909 Boundary Waters Treaty signed by the two nations.
Trump’s proposal echoes his earlier action to rename the Gulf of Mexico to the Gulf of America in January 2025. That change was accomplished through an executive order, which directed the U.S. Board on Geographic Names — a federal agency within the Department of the Interior — to update official federal nomenclature.
However, renaming a shared international waterway presents legal complications that the Gulf of Mexico did not. According to experts and analysts, the U.S. can only change the name on its own federal maps and documents; the change cannot be imposed internationally or on Canadian maps and records. Any renaming would require coordination with Canada, as the lake is governed by international treaties and joint management agreements.
The U.S. Board on Geographic Names, which has authority over geographic nomenclature for federal use, was established in 1890 and reestablished in its current form in 1947 by Congress. The board standardizes geographic names within the U.S. federal government, but its authority does not extend to renaming shared international waters without partner nation consent.
Trump’s proposal is the latest in a series of territorial and naming assertions. In January 2026, Trump shared maps depicting Greenland and Canada as part of the United States, intensifying his push to acquire Greenland on national security grounds. He has also suggested that Canada become the 51st state, and recently posted a map claiming the Strait of Hormuz as new U.S. territory.
Sources
- New York Times — Trump’s statement on Lake Ontario renaming via social media, August 25, 2026
- Associated Press — Trump floating idea of renaming Lake Ontario as trade war with Canada intensifies
- ABC News — Lake Ontario as shared international waterway jointly managed by U.S. and Canada
- NewsNation — U.S. Board on Geographic Names authority and responsibility for naming geographic features
- The Conversation — Legal analysis of geographic renaming authority and international boundary water restrictions
- Reuters — Trump’s social media post on Lake Ontario renaming amid Canada trade war
- Canada.ca — Boundary Waters Treaty signed January 11, 1909, and International Joint Commission
- The Globe and Mail — International Boundary Waters Treaty Act governance of shared water bodies
- Washington Post — Trump’s Lake Ontario renaming proposal and trade tensions with Canada
- Cornell University — Lake Ontario as shared resource jointly managed under international agreements
