Ameliorate Border States

Directions: grammatically correct the following 3 sentences. There are five missing commas. There is apposition, too. Can you find it?
The border states were the slave states that did not leave the Union these states included Delaware Kentucky Maryland and Missouri West Virginia also considered a border state was created in 1863.

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Suggested Answer:
The border states were the slave states that did not leave the Union. These states included Delaware, Kentucky, Maryland, and Missouri; West Virginia, also considered a border state, was created in 1863.