I Believe the answer is: Personal records
Personal record revers to a form of primary source which information is derived from the observation or the experiments that being done by the source writers themselves. In most cases, personal records are created by experts on the relevant fields.
The economic differences between the <em>North</em> and the <em>South</em> led to conflict due to the South's reliance on <u>agriculture</u> led to their dependence on <u>slave labor.</u>
<h3>What is the conflict between the North and the South?</h3>
The economic differences were the major reason that initiated the Civil war between the North and South.
The Nothern regions were more into manufacturing activities while South was dependent on agriculture-related to cotton.
Therefore, the North experinced the industrial revolution but the South was still struggling with <em>slave labor</em> that <u>detorirated</u> their lifestyle.
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It was harsh. They had to work on the Manor. They couldn't leave the manor nor be forced off it. The person the serf is working for owes them protection and the serfs give labor and loyalty.
Prior to European contact, the Indigenous peoples of North America had numerous advanced civilizations. The Europeans brought diseases which destroyed much of the Native culture and killed up to 90% of the Native population.