By what means did Darius I keep the conquered peoples in subjection? Describe the situation of the conquered countries

Indeed, Darius I contained a huge army of spies, but in addition to them in each district (and there were 20 of them) there was a part of his army. Every year he personally arranged a review of his armed forces, kept the army on alert. Residents of the conquered countries had to pay him taxes in gold or silver.

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