Incidentally, if I may ramble about my WIP future fiction: the United States of America, which by the time of the socialist revolution had annexed Canada, was replaced with the Union of the Leagues of Commons of Turtle Island, commonly known as "Locoti". The terms "America" and "American" were largely relegated to the history books after that point, except in reference to:

1. A new ethnic group descended from refugees of the Second US Civil War, who called themselves "Americans" partially to skunk the term in reference to any bit of land between the Atlantic and Pacific.
2. American Sign Language and its users.