The communist revolution in russia in 1917
The assassination of Archduke Franz Ferdinand of Austria-Hungary by Serbian nationalists.
Germany invaded Poland, causing Britain to declare war on the 3rd of September 1939.
lmmediate cause is the final act in a particular result or event
The election of Abraham Lincoln of the newly-formed Republican Party, which had banned the creation of any new slave-states.
You have not told us which event, or which revolution you are asking about.
The assasination of Archduke Franz Ferdinand
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Invasion of poland
Stock Market crash in 1929
invasion of poland
The communist takeover brought the genocide in Cambodia.
Hitler's invasion of Poland in 1939.
Election of Lincoln
The First Crusades was triggered by the movement of Muslim religions into the area of Jerusalem. The First Crusade was declared in 1905 by Pope Urban II.
The shock wave from a supernova explosion.
The communist revolution in russia in 1917