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.

Answer 1

"Similar systems developed in China and Japan"

Answer 2

One significant indication that the European feudal system was effective was that "Similar systems developed in China and Japan" although it should be noted that this isn't enough evidence to prove that it was economically successful.Hope this helps!!!