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I'm inspired to post this thread after exposing myself to the "Crimson Skies" series which is set in a world where the USA Balkanizes circa 1930. The cause of this in the series is a number of events including the decision to allow alcohol prohibition to be delegated state by state and not made law across the country which leads to cultural divides across state lines and a second outbreak of influenza similar to the Spanish flue. These events then make the Stock Market Crash of 1929 the stray that broke the camels back and the states of the USA as well as the provinces of Canada disunite and form into 27 different countries.
I'd like to see what other ideas can be formed by the members of this site which could be used to create other TLs in which the countries of America (Canada, Mexico, and the USA) could plausibly Balkanize after 1900. This is a task which I find very exciting but extremly difficult to accomplish after 1900. Any ideas would be appreciated as they could help me in forming a TL I'd like to write with this very setting.
PSlease post other ideas besides a Yellowstone eruption.