What was one significant indication that the European feudal

What was one significant indication that the European feudal system was effective? Similar systems developed in Chine 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.

Solution

The one significant indication that european feudal system was effective :-

Answer:- Similar systems develpoed in china and japan.

Note:- However this was not a quite enough evidence that the european feudal system was economically successful.