Imagine that a historian has discovered a diary written in 1848 by another German revolutionary.Which statement best explains how this discovery could be used?

A diary written in 1848 is a primary source from the time of the revolution. A historian could compare its account with Schurz’s recollection to see whether the two sources support the same details; this is called corroboration. It would not by itself prove that no revolution occurred or establish where Schurz was.

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