Which primary source document could a historian understand why the us civil war started?

The primary source document that could help a historian understand why the us civil war started is a Charleston Mercury editorial published in 1860.

Charleston Mercury editorial published in 186. a year before the US Civil War broke out , would be and ideal item for an historian who attempts to comprehend the situation in the US at that time. Newspaper articles constitute one of the primary sources implemented in order to study history due to the fact that they could be evidence and testimony.

b, public works good luck

b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.