The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, and nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. ... When Russia began to mobilize to defend its alliance with Serbia, Germany declared war on Russia
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The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, and nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. ... When Russia began to mobilize to defend its alliance with Serbia, Germany declared war on Russia