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<span>The North's rapid economic growth during the Civil War was stimulated by C. increased government demand for many products. Since the war was ongoing, America needed many products, such as war supplies, medical supplies, food, clothes, etc. During wartime, government seeks more and more products so it can go through with the war.Hope I helped! :) Cheers!</span>
Mostly due to the ideas of Manifest Destiny. They started going westwards with the desire to span the United States from coast to coast, and then they started going worldwide. The idea behind it is that the United States were destined to help the world become free and democratic like they were so they started helping people worldwide in rebellions against colonialism or in similar affairs.