They were all slave states that had remained in the Union and this is what Missouri, Kentucky, Maryland and Delaware had in common during the Civil war. The correct option among all the options that are given in the question is the second option. I hope that this is the answer you were looking for and it helped you.
Answer:
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Explanation:
It would be D for this answer
Hey there!
The answer is: The population grew because of job opportunity
Hope this helps!
~Cutelion918~
