Missouri was allowed to join the USA as a slave-state. Other territories within the Louisiana Purchase, south of Latitude 36.30, could also join as slave-states.
The Border States were a key part of the US Civil War. They were slave states that did not join the Confederacy, it was important for the Union to prevent that they did not secede and join the South.
what were the slave state that did not secede and join the confederancy
It was one of the slave-states of the Upper South, which were less dedicated to slavery than the Deep South.
The Confederate leaders wanted as many states as possible to join them. Whether non-slave states could join was moot, since all of the non-slave states were in favor of preserving the Union.
border states
Eleven Southern states eventually joined the Confederacy and these fought in the US Civil War. Other slave holding states such as Missouri, Kentucky, Maryland and Delaware were part of the Union during the war. Slave owners in the former three states may have wished to join the South, however, they were a minority group of people.
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The Northern slave-states of Kentucky and Missouri.
California (New respondent) No, it was the four slave-states of the Upper South that had remained loyal. Kentucky, Missouri, Maryland and Delaware.
The chance for a couple more slave-states, and a tighter enforcement of the Fugutive Slave Act, with official slave-catchers employed to hunt down runaways.
There was and even amount of slave and slave-free states