Primary sources can account for events they were in, which makes the statement more accurate. Secondary sources can only take information from older records, which can be flawed if the person who wrote down, drew, etc. was creating fiction, or the information could me misinterpreted.
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Primary sources are sources that were produced during the time period being studied. This gives them the advantage of authenticity. Unlike secondary sources which provide modern analysis of history, primary sources are able to give you the true perspective of the people of that time period.
