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With a PoD after the year 1890, ruin American-German relations to the extent that American military planners will prepare for a war with Germany, and public opinion will strongly support going to war against Germany if a Great War breaks out. Some possible ideas I have thought of:
Germany expresses support for Spain in the Spanish-American War
Kaiser Wilhelm says something stupid, like encouraging German-Americans to stay loyal to Germany and not assimilate
Americans somehow feel slighted by Germany at the Boxer Rebellion
Germany buys the Danish Virgin Islands and sets up a military base there
German becomes involved in Mexico, and that involvement becomes obvious
I don't think any of these alone would be enough, but many of them together could work. Anybody else have any ideas that could meet this challenge?