"The new Republican Party arose in the 1850s. Its platform opposed the expansion of slavery. When Abraham Lincoln, a Republican, won the election of 1860 with commanding majorities in both houses of Congress, Southern states panicked, worried that the federal government would not only stop the expansion of slavery, starving them of new markets for slaves, but also abolish slavery in the South, which they saw as an assault on their states' rights. These fears caused South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, Tennessee and North Carolina to secede and form the Confederate States of America."
"The new Republican Party arose in the 1850s. Its platform opposed the expansion of slavery. When Abraham Lincoln, a Republican, won the election of 1860 with commanding majorities in both houses of Congress, Southern states panicked, worried that the federal government would not only stop the expansion of slavery, starving them of new markets for slaves, but also abolish slavery in the South, which they saw as an assault on their states' rights. These fears caused South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, Tennessee and North Carolina to secede and form the Confederate States of America."
And since the end of the civil war we've seen the erosion of states rights, proving their fears true.