When a historian uses the skill of corroboration ,he or she: a. determine whether a source should be considered primary or secondary b. criticizes a source for being biased toward one point of view c. create a proper citation to acknowledge the sources importance d. confirms information from one source you see several other sources

D. Confirms information from one source you see several other sources

Explanation:

Corroboration is the action of double checking information from one source, and searching for different sources, this is done in several social sciences, like history, sociology, anthroplogy, and in journalism, to chech te veracity of information that we have from a source.

was a long, primarily nonviolent series of events to bring full civil rights and equality under the law to all americans. the era has had a lasting impact on united states society, in its tactics, the increased social and legal acceptance of civil rights, and in its exposure of the prevalence and cost of racism. in the south violence and fraud in southern elections from 1868 to 1876, which had reduced black voter turnout and enabled southern white democrats to regain power in state legislatures across the south