Darius the great conceptualize his empire by emphasizing the system of Taxation to gain more financial wealth for the kingdom.
He expect all the tax collector should be very honest and should not accept bribery
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The uprising that resulted in the creation of repressive laws that restricted enslaved people would be The Slave rebellion led by Nat Turner in August 1831 I believe
Ramadan is your answer your welcome e
So they (the slaves) were treated bad because they weren't considered human beings