Question

Border states like Missouri, Kentucky, Maryland and Delaware
were part of the confederacy and did not have slaves.
were not part of the union and had slaves.
were part of the union, but had slaves.
were part of the confederacy and did have slaves.

Answer 1

were part of the union, but had slaves.

Answer 2

Is that your choice? :)

Answer 3

Yes @jabez177

Answer 4

I believe that's the answer.
@ILovePuppiesLol, may you check?

Answer 5

yes