The southern states certainly believed they had the right to secede, but most of the northern states disagreed. The question was answered by a sort of trial-by-combat called the American civil War.
Because the Confederacy lost the war and the Union was preserved, it turned out that no state had the right to secede without Congressional approval.
The South could not secede again. There are too many laws and enforcements that would make it nearly impossible for the South to secede.
yes yes yes because i said so
They thought they should be able to have slaves is one reason.
national sovereignty overrides state right
In 1860 South Carolina seceded from the union
South Carolina
South Carolina was the first Southern state to secede, on December 20, 1860. (see related question)
December 1860. It was South Carolina.
According to most Constitutional scholars, states in the United States cannot secede after they receive statehood. In 1861, there was a clear dispute about this. In the Confederacy, they wrote their constitution based mostly on the US Constitution. Their constitution clearly states that secession is illegal.
The North during the Civil War area did not think the South should secede however did nothing to prevent it.
South Carolina was the first state to secede from the Union.
South Carolina