They where used in the war or they cam from the place they where at war with.
WW1 led to the collapse of the German navy. As stated in Treaty of Versailles, Germans had been stripped of their naval forces and had been blamed for causing the war. They had been made to pay for all the damages they caused. This naval mutiny combined with public unrest in late 1918 convinced civilian political leaders that the Kaiser had to abdicate the power.
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communism
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Also it was never actually created by Russia and China though they were taking steps to try to achieve it.
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Native populations were dying from diseases.
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