they didnt
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.
Delaware, Maryland, Missouri, and Kentucky.
Kentucky, Missouri, Maryland, Delaware.
The Northern half of the state supported remaining with the Union. Washington DC's influence was stronger in Maryland because DC existed on Maryland land.
Delaware (perhaps the most overlooked border state), Kentucky, Maryland and Missouri were the border states that did not secede from the Union.
Missouri, Kentucky, West Virginia, Delaware, and Maryland.
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.
Because Washington, D.C. (the nation's capital) lies between Maryland and Virginia. President Lincoln placed much of Maryland under Martial Law during the war to protect the capital.
Four slave-states of the Upper South - Kentucky, Missouri, Maryland and Delaware.
Maryland was one of the so-called "border states", it had slavery but did not secede from the Union. Maryland-like many states- provided soldiers to both sides in the conflict.