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The treaty of Versailles had the goal of developing a treaty that would punish Germany and meet the goals of the various Allied Powers. Along with creating four terms that Germany was set to comply with.
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The world's first international security organization goes into operation. The United States does not join, and Germany and Soviet Russia are not admitted
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Gains the leverage to split the European Socialist parties and establish a more or less significant Communist party in each country. Gradually they are assimilated to the Bolshevik party model, and by the later 1920s nearly all are slavishly subservient to direction from Moscow
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Mussolini becomes Prime Minister of Italy, his regime eventually set up a model that others aspire to imitate, particularly in Eastern Europe and the Balkans.
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An era of good feeling in European international relations witnesses major agreements that ease reparations and guarantee frontiers. Germany is admitted to the League of Nations.
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Stalin defeats the last of his major rivals for power in the period after Lenin's death. Over time Stalin's ascendancy brings forced industrialization, brutal police repression and purges, a deeply suspicious attitude toward the outside world, and rigid control over foreign Communist parties.
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The American stock market crash starts a world-wide Depression, which is at its worst in most of Europe from the summer of 1931 through the end of 1932 and in some places much longer.
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Japanese armies open a long undeclared war against China in Manchuria. Attempts to restrain Japan through the League of Nations or by other means all fail, weakening faith in the international order.
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Hitler becomes Chancellor of Germany. He and his Nazi party are in full command in a matter of months.
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The Third Reich withdraws from the disarmament conference and the League of Nations.