Trump renamed Lake Ontario for US federal use. Canada does not have to follow.
The order changes the US geographic-names system. It does not create a universally binding new name for the shared lake.
- What changes: The order directs the Interior Department to update the federal Geographic Names Information System within 30 days. US federal agencies would then use Lake America.
- What does not: The US cannot require Canada, international bodies, private mapmakers or the public to adopt the name. Canada can continue recognizing Lake Ontario.
- Why now: The order follows a worsening US-Canada trade dispute. About 47% of the lake lies within the United States, but the waterbody is shared.