There were four: Kentucky, Missouri, Maryland and Delaware. (And the Western counties of Virginia, which soon formed their own non-Confederate state, West Virginia).
Lincoln was especially anxious not to upset the people of these states and drive them into the arms of the Confederacy. When he issued the Emancipation Proclamation, he allowed these 'Buffer States' to continue practising slavery until the war's end.
38 percent
The Border States, or the Buffer States.
Those states seceded from the union in attempt to maintain the right to own slaves.
There were four slave states that did not secede from the union, Missouri, Kentucky, Maryland, and Delaware. Slaves in these states were not freed till after the civil war; not even by the Emancipation Proclamation.
Missouri, Kentucky, West Virginia, Delaware, and Maryland.
They seceded from the Union because they did not want to lose the slaves that the plantation owners had. Thus, they seceded from the Union to keep them from losing their slaves.
Borders do not secede but states do. Kentucky, Maryland and Missouri were border states that did not secede in the union.
The states that DID NOT secede from the Union was Delaware, Maryland, Kentucky, and Missouri. These four states did not secede from the Union because They were Border states, meaning they were between the Union and the Confederacy.
Because those states were divided in pro and anti-Confederate opinion, and voted (sometimes narrowly) against secession.
Borders do not secede though some states did.
Some of them are for freedom. Also for the right to keep slaves. Those are only two reasons, but there are more.
Because at the beginning, it was not an abolitionist war. Lincoln had been elected on a ticket of no new slave-states, and this is what caused the Southern states to secede from the Union.