World War I (28 juill. 1914 – 11 nov 1918)

Description:

- US found it difficult to be a neutral nation and still protect US trading rights as both central and allies power keep seizing and sinking US ships
- US began to support the allies side with more trade
- US joined the war at April 1917
- Treaty of Versailles was signed with the disarmament of Germany and the establishment of the League of Nations
- United States did not ratify the Treaty of Versailles and failed to join the League of Nation because of isolationist believes

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