Bias is something we simply cannot eliminate when talking about issues or past events. Every person has their own views regarding everything, even if the given person does not care he or she still will take a stance that won’t be the exact center. A lot of times there is no center, especially when the pro- and con- side’s ideas are not compatible. For example if you were asked “do you believe in evolution or creationism” you have to take a stance. If you write an article, if you were to truly avoid biasing the main idea, you would end up with a dry list of facts and/or ideas.

In primary documents the bias present is derived from position of the author on the given subject. A memo written by a child of a freed slave regarding the “emancipation proclamation”  would describe the event as the humanity’s finest hour. While one written by a plantation owner who lost his whole free workforce would call the event the worst thing ever.