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The answer is D. 90 %

in that time, the south was predominantly an agricultural area, the north on the other hand is full of manufacturing companies and economic entities.

For comparison, in 1861 the north manufactured about 3200 fire arms for every 100 fire arms that the south produced
Neuron
The correct answer to your question is d - 90 percent. 

This fact also made the figh for South very uncomfortable because they knew that the Northern countries were the ones who were producing most of the things. This in end also proved to be a very important reason why the South lost the civil war in the US. 
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