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Union
union. It was one of the four slave states in the Union
It joined the Confederacy.
Maryland joined the Union on April 28th, 1788. It was the seventh state to join the Union.
The Union was the North - all the states that had not joined the Confederacy.
Maryland did not join the Confederacy. However. as a border slave state (like Kentucky, Missouri, and Kansas) Maryland had individuals who fought for the Confederacy during the US Civil War.
Three states, Kentucky, Maryland, and Missouri were slave holding states but did not join the Confederacy. Each of these states have complex reasons for remaining in the Union and yet retained their slaves. Tennessee was a slave state and joined the Confederacy. The latter was late, joining the South in May of 1861.
Kentucky, Missouri, Maryland, Delaware
The Union was the name given to that part of the United States that had not joined the Confederacy.
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.
All of the states at that time either stayed in the Union or joined the Confederacy. Geographically. Geographically, there were no states in between the two nations. The Border States is the term given to the slave states that chose to stay in the Union. They included Kentucky, Delaware, Maryland, Missouri and West Virginia. (West Virginia succeeded from Virginia after Virginia succeeded from the Union in order to avoid fighting for the Confederacy.) They were all near the border of the Confederacy. They knew that whichever side they chose, there would likely be fighting on their territory.
Tennessee was the last state in the Union to join the confederacy. Tennessee joined the confederacy of due to laws being passed regarding the institution of slavery.