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The Archduke Ferdinand got Assassinated but the United States remained neutral -
Germany proceeded to bomb the Lusitania and that caused the U.S to get mad at the Germans and they wanted to sign a paper that said no more bombing of American ships, but of course Germany didn't listen. -
The united states officially declared war on Germany and that influenced the way other countries would fight -
The first set of many American troops land in France to plan something on Germany. -
Germany signed a peace treaty between them and all the allies saying no more war. -
The Versailles Peace Treaty was signed officially ending World War I for good.