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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.
nevaehpuebla1976

Answer: 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.

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