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The main cause was the conquest by the Ottoman Turks in 1453.
means to cause a downfall
because it is a myster
He died prematurely.
Downfall in what? A bigger or more organised gang beat them. Which is not too difficult. Weeds do it.
inevitable cause of one's downfall or defeat.
His death. He was emperor until he died.
because they want something change to their government
The horses failed.
Yes, the compound noun 'downfall' is a common noun, a general word for a loss of power, prosperity, or status; a general word for the cause of such a loss; a general word for any downfall of any kind.
Nationalism, corruption, technological and economical downfall
they died cause they shot each other