The internal factors of the government and economy played key roles in the decline of two empires. The political confusion of the Roman Empire caused a pattern of weak leaders and the army’s intervention with the selection of the next rulers contributed to the spiral down of the empire. Although the succession problem in the Abbasid Empire was different it still took place. The decision made by the Abbasid government, to create new capitals added additional expenses to the already weak funds of the empire that were previously caused by caliphs’ desire for building monuments and a life of luxury. This made the government demand more money from the people who eventually began to leave and abandon many villages and towns in the empire.
The military of the two empires evidently weren’t strong enough to protect the empires from invaders. In the Roman Empires case it became difficult to employ troops, and the need to pay them added to the already large amount of debt the empire was in. By the time the Germanic invasions began barely anyone resisted the attempts to take over on account