Civil War
They justified secession with the theory of states' rights.
Secession
what were the pro slavery anti secession statesgenerally known as border states
The act of withdrawing a state from the Union of the United States is called "secession". By definition secession has happened in many countries throughout the years, but the most relevant example of secession in the United States occurred in the 1860s with the secession of 11 states from the United States who formed their own government and declared themselves the "Confederate States of America". What resulted was the Civil War, which lasted from 1861 until 1865 when the Confederate States of America were defeated and forcibly re-entered into the United States.
The issues that led to the secession had been festering for a long time, but it was the election of Abraham Lincoln that precipitated the secession.
A term used for people who opposed secession of the states were called conservatives. The people that supported secession were called secessionists.
Politicians in slave holding states would surely, for the most part lean toward secession. There is no cut and dry answer on the matter. And, of course since many compromises had been created in US history, more likely that route would be anyone's choice. New Englanders secession regarding the Mexican War.
When the Confederate States declared themselves an independent contry they withdrew from United States of America, They were no longer 'united'. The union of the states was broken because they were no longer one country. The term for this was secede.
separating from the southern states to go on your own.
There were people
Well slavery was a big part of the southern secession.
The case that made secession unconstitutional in the United States was Texas v. White (1869). The Supreme Court ruled that states cannot secede from the Union and declared secession to be illegal. The decision affirmed that the U.S. Constitution does not allow states to unilaterally secede.