A historical source can be deemed unreliable if the author appears to unfairly favor a particular side or viewpoint. In this case, the source is
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A historical source is biased when it can be deemed unreliable because the author appears to unfairly favor a particular side or viewpoint.

What is bias?

Bias refers to a historian's perspective being strongly for or against an issue.

Historical bias refers to when the information in the source can be clearly described as unfair, unbalanced, or prejudiced.

Thus, a historical source is biased when it can be deemed unreliable because the author appears to unfairly favor a particular side or viewpoint.

Learn more about a biased historical source at https://brainly.com/question/1614300

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