How do historians make sure that they do not inject their own biases into their work?

Historians should produce evidence-based information.

Explanation:

The historical research not only considers and discusses the meaning of the sources but also their implications. Historical researchers recognize that one point of view is not completely right, there is a need for more information to reconstruct the events in question, and implies that the reader does not follow the author blindly. Historians need to refrain from their opinion and based their research on historical methods. Historians can provide reliable and persuasive scholarships by submitting their work for peer review and the academic world.

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the california missions began in the late 18th century as an effort to convert native americans to catholicism and expand european territory. there were 21 missions in all, lasting from 1769 until about 1833.   the missions were built by the spanish starting in 1769 in order to “colonize” the territory of alta california. so the missions were important because they were the means of settling california. it also wanted to keep other european countries out of alta california. building settlements along the coast would them meet these goals. missionaries wanted to convert the indians to the roman catholic faith. california indians did much of the work to build missions.