What are the major causes for the fall of the Eastern Roman Empire?

1.	What are the major causes for the fall of the Eastern Roman Empire?
Answer» of the declineCivil wars.• Fall of the THEME system.• Increasing RELIANCE on mercenaries.Loss of control over revenue.• The FAILED UNION of the Churches.Crusaders.• Rise of the Seljuks and OTTOMANS

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