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Germany's role was a defeated nation.
The discussions that ended with the Treaty of Versailles was held after World War One(WWI), where Germany was a defeated nation and the content of the treaty was about the punishment for Germany after being an aggressor who initiated the war and invaded the others,causing mass damage over Europe.
Some brief information about the treaty was that Germany was punished through disarmament, where only 100000 army were allowed to remain. The Saar coal field was also taken away and monitored by the League of Nations.
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After the defeat of Russia Japan focus on the expansion of its empire beginning with "China," since this presented them with the greatest potential in terms of harvesting natural resources.