Martin Luther King, Jr. Quote

The Emancipation Proclamation shattered in one blow the slave system, undermining the foundations of the economy of the rebellious South; and guaranteed that no slave-holding class, if permitted to exist in defeat, could prepare a new and deadlier war after resuscitation. The Proclamation opened the door to self-liberation by the Negro upon which he immediately acted by deserting the plantations in the South and joining the Union armies in the North.

Emancipation Proclamation Centennial Address (1962)