The difference that existed between the political structures after the Roman Empire fell was that:
The West no longer had a strong and a centralized government. Due to the weakness of the new government, feudalism developed there after the fall of Rome.
The Easter part became the Byzantine empire. This part of Europe continued to thrive after the fall of the Roman empire.
Read more on the fall of the Roman empire here:
https://brainly.com/question/1276486