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Demands for states' rights were dangerous to the union
The states struggled to find out if Slavery was good or bad.
Actually there were two major issues that were decided by the US Civil War. The end of the Confederate rebellion made it clear that secession from the United States was eventually as being illegal. The Union's victory in the US Civil War also meant that slavery would be abolished in the US by the 13th amendment.
Lincoln stood firm on secession to evolve US as a great nation and great country and at the cost of Civil War and he achieved him aim. He sent a ship for supplies at Union fort in South Carolina and it was fired thus starting the Civil War. He showed his abilities in command , politics and diplomacy to become a great president of US.
The attitudes toward secession varied greatly between northern and southern states. The north was attempting to keep the country unified, while the south continued to threaten with its ideas of secession, wanting to be a separate nation.
The Secession and the Confederate attack against Fort Sumter.
He was right.
Demands for states' rights were dangerous to the union
Secessionists believed that secession was the only solution to the issue of preserving slavery and states' rights, while Unionists opposed secession and wished to stay in the Union.
The Federal-State relationship
President Abraham Lincoln spent a good portion of his 1861 inaugural address on the issue of secession. That part of his speech took the form of a detailed legal brief denying the constitutionality of secession. His words dovetailed the illegality of secession with his oath as president to hold, occupy and posses the property and places belonging to the US government. He equated secession with anarchy.
the south wanted slavery to still exist even if the union was split
The overwhelming issue in 1860 and 1861 was slavery and later the secession of several Southern states.
One key issue that would have remained if the Confederate states had gained their independence was the validity of secession. The Confederate constitution resolved this by making secession illegal. The US would have required a constitutional amendment to ensure there would never again be secession.
The most prominent person in the North who believed that secession was unconstitutional was President Lincoln. He was in step with many other Northerners.As an aside, the Confederate constitution sought to clarify this issue for its own states. Confederate states were not legally allowed to secede form the Confederacy as a clause within their constitution forbid secession.
When contributions are given to interest groups they then can afford to promote their issue in the media and contribute to politicians. When interest groups contribute to a politician it raises the politician's awareness of their issue and it could theoretically influence the politician's opinion about the issue.
The issue was self defense.