The North American Union (NAU) in OTL is a theoretical regional union of Canada, Mexico, and the United States possibly similar in structure to the European Union, sometimes including a common currency called the Amero or the North American Dollar. While the idea of regional integration has been discussed, proposed, or debated in academic, business and political circles for many decades, government officials from the nations say there are no plans to create such a union and no agreement to do so has been signed. The formation of a North American Union has also been the subject of various conspiracy theories.

In some timelines there are actually nations called the North American Union, though they are hardly similar to the current OTL proposal:

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