Which of these was specifically permitted by the Emancipation Proclamation?

The Emancipation Proclamation declared enslaved people in areas rebelling against the Union to be free and also permitted African Americans to serve in the Union armed forces. It did not free enslaved people in the loyal border states, nor did it authorize service in the Confederate military. Therefore, the correct choice is that free African Americans were allowed to enlist in the Union army and navy.

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