The major result of the civil war was that it helps in preserving the union in the country. Thus the correct answer is B.
There are many reasons of the events of the civil war which including slavery. It focuses on to freedom of enslaved people from the United States. The expansion took place by the United States which give rise to conflicts in the distribution of power.
Based on these events, the civil war resulted in the presence of unions and strengthened the central government's power to rule and control the Nation.
Therefore, option B preserving the union is the appropriate option.
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