What is a border states?

Answer 1

In the American Civil War, the border-states were the four slave-states of the Upper South that had voted (narrowly) to stay loyal to the USA. They were Missouri, Kentucky, Maryland and Delaware.

At the beginning of the war, Lincoln's biggest worry was that these states would fall into the arms of the Confederacy. This was why he allowed them to continue practising slavery, so as not to upset leading slave-owners in these states.

Answer 2

most probably the possessive case

but just with the usual apostrophe omitted

of

a border state

which itself is

any state that runs along any border

so in a nutshell

a border states is most likely

or at least can be

anything belonging to any state that runs along any border

Answer 3

Border states are U.S. states that border Another Country (Mexico or Canada). These states often have unique economic, social, and political dynamics due to their proximity to another country. Examples of border states include Texas, California, and New York.

Answer 4

a state border is the border of state