When Rome fell an organized and centralized Empire that included most of Mediterranean disappeared. Common language, culture and language were also lost.
Explanation:
Roman Empire was the largest empire at the time, that was organized and centralized and spread across most of the known world at the time. Common language, religion and culture were established. It was the peak of the human development until then. But, when the Germanic tribes destroyed Rome, they destroyed the achievements of the Empire. They destroyed trade connection, they destroyed cities. Knowledge was lost. Schools disappeared. It was a large step back.
States and the federal government have both exclusive powers and concurrent powers. There is an ongoing negotiation over the balance of power between the two levels.
