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* The cause of World War I was the assaniation of Franz Ferdinand. Him and his wife was killed by a guy that was from Serbia. Then they wanted to fight Hungary. Once they did that most olf the countries in Europe started to declare war on each other. They used nationalism in order to winthe war. Each nation workedamongest themselves in order to outsmart the other nation. Germany had alot weapons. They had machine guns and everything. Some countries tried to side with each other. They even formed alliances. The triple alliance was formedby Germany, Great Britian, and France. Eventually they broke up and fought againist each other.