The answer is slavery. The Republicans were anti-slavery, while the democratic south was pro slavery. Eventually that, and a couple of other things, led to the Civil War.
Sorry if this was a bit late, Brainly had just recommended this question for me to answer, but I hope this helps!
Answer:
shattered the unity of the Roman Catholic Church because it challenged the church's authority and the position of the clergy.
Through the Compromise of 1877 in which the Republican party agreed to remove Union troops from the South so that the South would recognize and respect the election of Rutherford B Hayes.
