One long-term consequence of the fall of Rome was that

Rome's fall ended the ancient world and the Middle Ages were borne. These “Dark Ages” brought the end to much that was Roman. The West fell into turmoil. However, while much was lost, western civilization still owes a debt to the Romans.

Upon the fall of Rome, Europe ceased being influenced by the cultures of the Mediterranean coast and was more influenced by Germanic tribal confederations that had already taken over vast swathes of Roman territory, although the influence of Rome on the former Empire was very strong in legal, cultural, religious

Explanation: What were the causes and effects of the fall of Rome?

External military threats were a major cause of Rome's fall, and its effects spread across the empire. After Rome was divided, a powerful group known as the Huns began moving west, their numbers growing with captured prisoners and new allies. People from all walks of life were eager to reap the rewards of war.

it gave them more rights

in an absolute  monarchy, the  monarchrules as an autocrat, with absolutepower  over the state and government — for example, the right to rule by decree, promulgate laws, and impose punishments. the  monarch isnominally sovereign but the electorate, through their legislature, exercise political sovereignty.