Diaries, letters, and memoirs are good examples of what?

Primary sources

Diaries, letters, and memoirs are good examples of primary sources.

Explanation:

Primary sources are known as record of events which enable an individual to get an actual fact about past events. Furthermore, they are first hand testimonies which give account of what transpired during an event and this is done by taking the record at the time it happened or after. Thus, examples of primary sources are: letters, diaries, memoir, newspaper report, speeches, creative writing, court records and so on.

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explanation:

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answer; collective security;