Why would a researcher use a secondary source instead of a primary source
when analyzing a historical event?

A. To see the event through the eyes of someone who witnessed it

B. To hear about the event from someone who was directly involved

C. To learn from the conclusions of many other experts on the event

D. To understand how people felt during the period when the event
happened

Reynolds's political map of the united states shows free states, slave states, and areas open to be free or slave after the repeal of the missouri compromise. reynolds’s political map of the united states showing comparative area of the free and slave states following the repeal of the missouri compromise. southern states are gray. northern states and california are red. territories to the west are green. kansas is not filled. by reynolds [public domain], via wikimedia commons how is the compromise of 1850 reflected in the map?