What was the economic relationship between the north and the south in the early 1800s?

This was the time of the Industrial Revolution.  The economic relationship between the north and the south in the early 1800s was that the south grew the majority of the crops and then it was sent to the industries in the north to be processed into material.  Example cotton was grown in the south and sent to the north and turned into cloth.  

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

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