Answer:
The border states, which had not seceded, but separated the United States from the Confederate States, were of great importance to the Northern war strategy. In order to win the war, the Union Army would need to pass through the border states to invade the South. On the other hand, the border states, if they joined the Confederacy, would make it extremely easy for the Confederacy to attack and occupy Washington D.C.
Explanation:
It think the theme is saint Patricks day which is green
