USA trade intrests in the Mediterranean and the Atlantic were severely affected, and any effort to secure those intrests meant war. In addition, after the war, the world became polarised and the Soviets who were communists were aggressively expanding around the globe, which implied that American system of free trade and democracy was being threatened.
The assassination of Archduke Franz Ferdinand in Sarajevo on 28th June 1914, it triggered a chain of events that resulted in World War 1. After the assassination, Austria-Hung. During the conflict, Germany, Austria-Hungary, Bulgaria and the Ottoman Empire (the Central Powers) fought against Great Britain, France, Russia, Italy, Romania, Japan and the United States (the Allied Powers). World War 1 lasted from From August 1st 1914 to 11 November 1918. It lasted 4 years.
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Civil wars. Probably the most important single cause of Byzantium's collapse was its recurrent debilitating civil wars. Three of the worst periods of civil war and internal infighting took place during Byzantium's decline.
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