What was one significant indication that the European feudal system was effective?

Similar systems developed in China and Japan.
European peasants voted to keep the system in place.
Invaders did not manage to attack Europe.
The system put an end to the Roman Empire.

Question

What was one significant indication that the European feudal system was effective?

Similar systems developed in China and Japan.
European peasants voted to keep the system in place.
Invaders did not manage to attack Europe.
The system put an end to the Roman Empire.

anonymous · Answer

Didn't I already answer this question for you? @kitties_rules

anonymous · Answer

i posted the same question on accident. oops @Khirro