this means that to understand history more accurately  we divided it into part for example the british divided indian history into three part HINDU MUSLIM CHRISTAN .. the classificationn was correct as the early days were ruled by kings like ashoka later mogul dynasty came and later christan .. but thedisadvantage was that many king s like shivaji actually lived in muslim era etc .. that is many kings and rulers were overshadowed because of time in which they lived
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