It is one sided account due to manipulation in the history and wrong information is provided.
History is always one sided account means that the full truth can't mentioned in the writing by the author. Sometimes history can be manipulated in order to make itself right and put he blames on the oppose party or people. There are few authors that provides complete and right information about history but most of them write the prospective of only one party so that's why it is said in nature history is one sided account.
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