OTTAWA — Prime Minister Mark Carney delivered a firm response Thursday following U.S. President Donald Trump's unilateral move to executive-order Lake Ontario into "Lake America".
Writing in direct defense of Canadian sovereignty and geography, Prime Minister Carney highlighted the deep Indigenous and historical roots of the body of water. "The name Lake Ontario comes from the Wendat word Ontari’io, which, appropriately, means 'the lake is beautiful, the lake is big,'" Carney stated. "The name is more than 400 years old, predating both the Confederation of Canada and the Declaration of Independence of the United States of America."
The exchange marks another sharp dip in trans-border relations, following Canada's decision to walk away from trade negotiations and match incoming American tariffs.
Acknowledging the rapidly shifting political landscape in Washington, Carney emphasized that local geography is not subject to U.S. executive decrees.
"We know that America is changing. Their trading relationships, their foreign policies, their national monuments, their hydronyms," Carney noted."Canadians also know that naming reality means calling it Lake Ontario – then, now and always."
President Donald J. Trump signed Executive Order 14420 on Thursday, ordering federal agencies to officially refer to Lake Ontario as "Lake America". The directive marks the latest name-change measures from the White House aimed at geographic features along U.S. borders.
The executive order published in the White House website cites American investments in security, environmental preservation, and regional commerce as the primary drivers behind the change.
The text of the order emphasizes the United States' role in maintaining the Great Lakes infrastructure, noting that the U.S. Coast Guard supplies nine of the 11 ice-breaking vessels operating in the Great Lakes region. The Trump administration also highlights a nearly $4 billion U.S. investment over the last decade toward Great Lakes ecological preservation, asserting that Canada has contributed significantly less over the same period.
Furthermore, the White House claims territorial primacy over the body of water based on depth, stating that "the deepest parts of the Lake’s waters" lie within U.S. borders, giving the nation claim to most of its physical volume.
Under Section 2 of the directive, Interior Secretary Doug Burgum, working in coordination with the Board on Geographic Names, has 30 days to execute the operational change under federal geography statutes. Federal agencies are ordered to purge references to "Lake Ontario" from official government maps, contracts, databases, and communications, replacing them with "Lake America".
The move builds on Executive Order 14172 ("Restoring Names That Honor American Greatness"), issued on Trump's first day in office, which set a policy precedent for renaming major geographic features. The directive affects the easternmost body of water in the Great Lakes system, which forms an international border between New York State and the Canadian province of Ontario.
In her post to her X account, Toronto City Mayor Olivia Chow says, "Donald Trump's antics won't weaken our resolve as Canadians."
While the executive order changes official designations within the U.S. federal government, foreign jurisdictions and international geographic bodies operate independently of U.S. domestic executive orders.
Despite Washington's direction for federal agencies to update American charts, Ottawa maintains that the international boundary lake will remain Lake Ontario under Canadian law and international mapmaking standards.
