If you want to use a source related to the subject you're looking for, make sure the person's location is relevant to your subject.
Elaborate:
How can a memoir be used as a source of history describe ?
It shows more peculiar and particular viewpoints on the topic, while personal essay and diary usually do not have such detailed perspectives and thoughts. This makes memoirs as the useful historical source. Each one of the memoirs is like a historical record by different historian.
How does the time and place in which a document was written help us to analyze it?
It allows us to see how the context or background information influenced the content of the source.
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