Respuesta :
Answer:
Brainiest
Explanation:
The border states during the Civil War were the slave states that didn't leave the Union. These states included Delaware, Kentucky, Maryland, and Missouri. West Virginia, which separated from Virginia during the war, was also considered a border state.
The border states were Missouri, Kentucky, Maryland, and Delaware. Delaware supported the Union, and had few enslaved people. Kentucky remained neutral, but after the Confederate invasion in September 1861, they joined the Union. Lincoln had to forcibly hold Missouri and Maryland.