Arvenia wrote:We could need one US successor state that is legitimately similar to the US and likely to have "American" as it's demonym, plus we need to figure out when the US split up prior to the 20th century, if the split happened in the 18th century or the 19th century.
I support having the US split up sometime after the American Civil War. My suggestion is that you can rewrite the war to have been more devastating that it was, maybe add some foreign nation support that never happened in real life. This led to the Civil War being prolonged significantly, and although the Union won and reunited the country, it soon collapsed anyway due to economic devastation and all that.