What was the most significant event in the american civil war? explain your answer.

Secessão war

Explanation:

the american civil war was an armed conflict between States of north and south of Estados Unidos. the separation between two states was the most significant event. The south, basead in the plantation system and monoculture versus the north, that starting your industrialization, with proletary class and burguesy formed, would want  the development alone for they and they does'nt want the south, with the algodon, complementing the economy of them.

d. china

good luck

d is the best choice