Which statement best describes the importance of the "border states"?

a)
states did not allow slavery but seceded.

b)
states that were along the border of texas.

c)
states that allowed slavery but were loyal to the union.

d)
states that first seceded and consider themselves a new nation.

The answer is C) States that allowed slavery but were loyal to the union.

The answer is C) because

...The statement that BEST describes the importance of the "border states" is states that allowed slavery but were loyal to the Union. Kentucky, Missouri, Maryland and Delaware had slaves but did not secede. Since they were southern sympathizers in these states Lincoln had to take stronger control during the war

States that allowed slavery but were loyal to the union. 

4.a depression is the answer