Question

Why would a historian wish to consult multiple sources of information on a topic

Answer 1

To verify that the information is true among several sources. This can be called cross examination.

Answer 2

To corroborate a primary source's claim about an event

Step-by-step explanation:

By checking different sources, you're actually making sure that you have different opinions and points of view about the same subject. Not only that helps with the reliability of the source but it also might reveal quite a few things about the same vent being studied. If 3 secondary sources differ from a primary source, for example, maybe there's something there that needs to be revealed or understood.