Why might a historian use periodization when writing about ancient greece

In a low-income household in the developed world, more than 30% of a woman's income typically goes toward a. transportation costs b. child care c. clothing and incidentals d. the repayment of educational loans

In the latter stages of the civil war who was given the responsibility of winning the war for the north

Unique among the rulers of this time, persian emperors installed governors in their provinces tolerated local cultures and laws wielded absolute power maintained an extensive army