Question

in the emancipation proclamation, president abraham lincoln declared freedom for slaves

in the parts of the confederacy already under union control.

in the slave states that had remained loyal to the union.

that joined the union military.

throughout all states that existed as part of the united states prior to the civil war.

in the parts of the confederacy still in rebellion.

Explanation:

The Emancipation Proclamation, issued by President Lincoln, declared freedom for slaves in the parts of the Confederacy that were still in rebellion against the Union. The other options are incorrect: the proclamation did not apply to areas under Union control, loyal slave states, or those joining the Union military in that way.

Answer:

in the parts of the Confederacy still in rebellion.