The immediate cause was the assassination of the Austrian Archduke Franz Ferdinand, the heir to the throne, and his wife by two Bosnian Serbs in Sarajevo on June 28, 1914. But the events that followed were so complicated that Barbara Tuchman's book *The Guns of August* provides a valuable insight into the compulsion to wage war. JFK was reading it during the Cuban missile crisis, aware of the danger of rushing into war.
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nationalism helped start WW1 By it helping all the soldiers get into the trenches and helping the U.S. side to get 2 the opposite enemy and to try to kill the opposite side of them Nationalism helped all the soldiers from escaping the from the war and also it helped out the opposite side from winnign the war and also NATIONALISM had a big imact on the Great war (yeah if u don't get this sorry)
The US helped France in world war 1 with submarines in the Atlantic.
Improved NCO training helped to compensate for the losses of officers in World War 1.
The GI Bill allowed paid for veterans to go to school, buy a house, or start a business.
Hitler survived world war 1.