I just remembered that Austro-Hungary gave Serbia a ridiculous ultimatum which sparked the First World War.
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Nah that was just the catalyst the main cause was a series of ridiculous alliances, promises, Germany's need to cement itself as an empire. War was inevitable, people were wondering when it would happen years before it actually did.
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Which is why I used the word "sparked". [url]http://en.wikipedia.org/wiki/Budapest_Memorandum_on_Security_Assurances[/url]