Why did the US economy grow at a rapid pace after the end of the Civil War?

The American Civil War, which took place in 1861-1865, became the starting point of the new state. In this war, the capitalist north fought the plantation south to introduce a republican form of government and establish a capitalist system. In the north of the mainland, progressive industrialists and capitalists lived. But trade and the exchange of capital impeded the activity of the south, with its vast fields and the use of slave labor on them. After the unification and establishment of the republic, all branches of the economy began to develop more actively in the country.