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| The United States joined WWI in 1917 |
World War One officially started in Europe in 1914. For the first time ever the world was a war. Before 1914 most wars were between countries sharing borders. No longer was that to be true. Then. Now. Future.
Because of the outcome of WWI, the United States became the most powerful military the world has ever known.
The United States came into the war three years after it had started in 1917.
