There were many immediate and underlying or fundamental causes of World War I. The difference between an underlying and immediate cause is that an underlying cause develops over a long period of time and indirectly leads to a specific event, and an immediate cause is a specific short-term event that directly leads to another event or series of events. While the immediate cause of World War I was the assassination of Francis Ferdinand, the archduke of Austria, by a Serbian member of the Black Hand secret society, there were various basic cau ....