The Bolshevik Revolution was the event that led to Russia's early exit from World War 1. It was a costly war for Russia.
The assassination of Archduke Ferdinand was a major event that led to WW1
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The assassination of Archduke Ferdinand was the one event that pushed Europe over the edge and brought about World War I.
German invasion of Poland
World War 1
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World War I
World War I
World War I
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America declaring war on Nazi Germany and joining the Second World War in Europe.