Who was NOT effectively freed by the Emancipation Proclamation?

A. enslaved people in states loyal to the Union such as Maryland, Kentucky, and Delaware

B. enslaved people in parts of rebel states under Union control

C. enslaved people in rebel states under Confederate control

D. The Emancipation Proclamation did not effectively free any of these people.

B is the correct answer because the Emancipation Proclamation did not free all slaves in the United States.

Rather, it declared free only those slaves living in states not under Union control. The proclamation declared "that all persons held as slaves" within the rebellious states "are, and henceforward shall be free." It applied only to states that had seceded from the United States, leaving slavery untouched in the loyal border states. It also expressly exempted parts of the Confederacy (the Southern secessionist states) that had already come under Northern control.