It is a primary source because the letters are an immediate, first-hand account of the topic (war).
His goal was to preserve the nation.
History is typically "The study of Human Past."
It is also the traditional study of notable events right in the ancient worlds.
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Do you need help using primary sources to teach about the Age of Exploration? I have spent hours digging through the Library of Congress and National Archives to find the best, student-friendly primary sources. (Click here for lists of kid-friendly primary sources for other topics.)Why use primary sources in the first place? The answer is summed up in this great quote from docsteach.org (the National Archive’s tool for teaching with primary sources).
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B:How Policy Disagreements Are Resolved