Archduke Ferdinand is a member of Austria-Hungary's ruling family., A group of people in Serbia (next to Austria-Hungary) assassinate Archduke Ferdinand., Austria invades Serbia (after the Archduke is killed), Russia, has a treaty to help Serbia, so Russia gets involved after Austria invades Serbia., Germany decides to help Austria-Hungary., France & Great Britain join to help Russia., Within a few weeks, most of Europe is involved in the war..

Immediate Causes of WWI

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