Question

Why is history divided into ancient medieval and modern period?

Answer 1

Because the vast subject consisting of numbers of events. Thus, we know that history is the study of past event in a systematic and chronological. So, in order to have a good case study about any event or war, time periods a made.
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Answer 2

Hello there your answer 

History is divided  into Ancient Medieval and Modern because for the easy understanding of the History to the people and time is  continuously changing no if the History is not divided then the will not be understanding when did that happen dividing History is to simplify it into smaller pieces 

Hope it helps you dear...