Why did revivalism catch hold on the early 19th century?

Religion was mobilized to defend slavery throughout southern congregations during the nineteenth century. Yet in the North, the evangelical revivalist movement known as the Second Great Awakening mobilized many Christians to become antislavery activists. The areas most affected by the revivalism of the Great Awakening mobilized their evangelical fervor and moral spirit to combat what they considered to be a deeply immoral and inhuman institution.

Idon’t know the answer sorry