One significant indication that the European feudal system was effective was that "<span>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.</span>
Answer:
Poll taxes, literacy tests, fraud and intimidation all turned African Americans away from the polls. Until the Supreme Court struck it down in 1915, many states used the "grandfather clause " to keep descendents of slaves out of elections.