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 book about the Korean War written by a contemporary historan
an interview of an eyewitness to some of the major battles of the Korean War
a speech by President Harry Truman about fighting communism through the Korean War
an encyclopedia entry about the geography of the region where the Korean War was fought