Who wrote a letter to Orville Browning where he recognized the importance of one of the four slave states that never declared a secession in the Civil War?
Border states (American Civil War):  Four slave states never declared a secession: Delaware, Kentucky, Maryland, and Missouri. Kentucky in the American Civil War: Kentucky was a border state of key importance in the American Civil War. Kentucky in the American Civil War:  President Abraham Lincoln recognized the importance of the Commonwealth when, in a September 1861 letter to Orville Browning, he wrote:
Abraham Lincoln