(A) Missouri Compromis of 1820
(B) Treaty of Guadalupe Hidalgo
(C) Kansas-Nebraska Act
(D) ** Emancipation Proclamation
EXPLANATIONS BELOW
Concept note-1: -President Abraham Lincoln issued the Emancipation Proclamation on January 1, 1863, as the nation approached its third year of bloody civil war. The proclamation declared “that all persons held as slaves” within the rebellious states “are, and henceforward shall be free."