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First World War
During this period the WW1 took place -
The allied leaders (France, Britain and USA) meet and created the Treaty of Versailles and other peace treaties ST Germain, Neuilly, Trianon and Serves
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Due to the high need for colective security and peace, the three main powers decided to create this world wide assosiation in order to sort out disputes between countries fairly.
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Germany on a huge conflict since France invaded the Ruhr, making an increase regarding inflation meaning that the german capital was worthless