The Civil War did not end state's rights. The supremacy clause has always existed. The Civil War made clear that 1) states did not have the right to enslave their fellow humans, which was the primary issue leading to the war and 2) states could not secede from the union in order to keep slavery legal.
The Civil War was about slavery. That's the "State Right" in question. There was no broader ideological movement regarding State's Rights involved. To claim otherwise is absolute revisionist history.
babe just had the good sense to make an argument that there was nice slavery and not quite as nice slavery and so it was more complicated than just saying the keeping humans as slaves is wrong. Ahh babe.
Lincoln was tapped for the Republican ticket by a group of bankers who intended to split the country. They thought Lincoln was the dupe for the day. For years, British agents and their banking cronies had bankrolled abolitionists and secessionists alike, often exploiting local Masonic lodge networks of like-minded dupes. When the breakup began, they had surrounded Lincoln with their advisors who all said "Just let them go". But they should have checked out Lincoln's character a little better. He clearly saw that if the Union broke apart, the pieces would be run over by European interests if not armies. He figured the only chance America as an idea of a government owned by the people could stand in this world, is we stuck together.
He didn't believe in slavery in the least, but he believed in the Union more than anything. The South was babbling about States' Rights, not about the slaves when they formed up their ranks. Some slave states did not join. Lincoln excepted those from the 1/863 proclamation, which in specific terms only applied to the rebel states.
Look, slavery could not have lasted, war or no war. Machines were coming, the slaves would hardly be economical when the farm machinery was available. Yes, many northern soldiers believed they were fighting to free the slaves. And the popular voice of Americans was heavily going towards ending slavery.
It took the Democrat Party to keep the race issues going after the war. Good ol southern democrats, clear up to Senb Byrd and Sen. Fulbright.
Exploiting local issues and dividing people of another nation or place has always been the British way to manipulating everything.