Consider the writing prompt.Write an informative, research-based essay that explains the main causes and effects of the Korean War.Which research source is both a secondary source and a source that would be relevant to the prompt?

A secondary source interprets or summarizes events using research rather than presenting firsthand evidence. A book about the Korean War written by a contemporary historian is therefore a secondary source, and its subject directly relates to the war’s causes and effects. The eyewitness interview and Truman’s speech are primary sources, while the encyclopedia entry focuses on regional geography rather than the war itself.

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