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A collapse of their newly independent nations. Although the diverse ethnicities were unhappy under the Austro-Hungary empire, they were secure under the government.
War
War times make people very patriotic or nationalistic.
German
The term "Hessians" refers to the approximately 30,000 German troops hired by the British to help fight during the American Revolution. They were principally drawn from the German state of Hesse-Cassel, although soldiers from other German states also saw action in America.