What was a major impact of the Civil War?

A. The members of Congress from Southern States immediately gained control of the legislative branch.

B. The economic system of the South came to dominate the United States economy.

C. The Federal Government's power over the States was significantly strengthened.

D. The nation's industrial development came to a standstill.

It's B because the North no longer had slaves to farm there crops and the south did so they had an advantage in the area.

(B) The economic system of the South came to dominate the United States economy.

Explanation:

Two of the most essential impacts of the Civil War were a blast in industrialization and the establishment of democracy in America. The Civil War finished slavery in America, and It didn't promptly carry fairness to African Americans.

It additionally averted the withdrawal of the Southern states, so the US didn't lose any of its domains. However, the pulverization of the South during the war radically frustrated the Southern economy from developing, which left the locale immature in contrast with the remainder of the nation for quite a long time to come.