In the united states, slavery played a major role in

In the United States, slavery played a major role in  the Civil War.

Explanation:

From the beginning of colonization in 1619, when the first slaves arrived in Jamestown, the problems of slavery and the struggle for the liberation of blacks marked the history of the United States and often divided the nation.

On the eve of the War of Secession (1861-1865), 8 million whites and 4 million blacks (about 500,000 free) lived in the southern United States. The agrarian structure served as an argument for affirming the need for slavery in the region. Racial discrimination was justified by a belief in supposed inequality among human beings.

When Congress officially banned the importation of slaves in 1808, no one imagined that the divergences between the industrialized North and the agricultural South were to worsen so much, to the point of culminating in a civil war. Slavery was the trigger for conflict, but its causes were a complex tangle of socioeconomic and political-cultural factors.