How do secondary sources help historian understand the past?

Simply described, a secondary data is a text or a video that presents or addresses material that was initially published elsewhere. These sources are of great help to historians as These are composed sometimes after historic incident by those who have not witnessed the action. Documents and artwork collected through primary texts and occurring after an occurrence are instances of supplementary sources. Oral memory is also another resource that historians use.

- "the most famous structure by far at saqqara is djoser's step pyramid. dating from the 3rd dynasty (2667—2448 bc), it was the first all-stone complex ever built on earth."

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im not sure its either a leader of a group of congresspeople or a person from a congressmans district

sorry im not sure