the murder of Austria Hungary Archduke Franz Ferdinand. It was bascically used as an excuse to start the war. Then Militarism, Alliances, Imperialism and nationalism took their toll to move it on.
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The assassination of Austrian Archduke Ferdinand was the immediate cause of World War I. He was killed by a Serbian terrorist, which caused Austria to declare war on Serbia. Serbia was allied with Russia, who intervened, causing Germany to declare war on Russia, which caused France to declare war on Germany.
The assassination of Archduke Franz Ferdinand of Austria in 1914 was the spark that ignited World War I. This event triggered a chain reaction of alliances and tensions among European powers, leading to the outbreak of war.
The 'spark' that caused WW1 would be the assassination of Archduke Franz Ferdinand, the Crown Prince of Austria-Hungary.
There are long term causes that date back to the late 1800s.