I think B preventing nuclear war
The cause would be rodents carrying the disease and the fleas would bite the human
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.
Learn more about economic conflicts here:
brainly.com/question/9440615
You did not include a timeline, but the American civil war lasted from 1861 to 1865