What would emancipation do to the northern army?

this is actually really interesting! So I'm sure you know about the emancipation proclamation of 1893? So within the text of the proclamation was an executive order that ensured the freedom of the slaves in ten Confederate states and ALSOO decreed that freed slaves could be enlisted into the Union Army. Henceforth increasing the North's manpower whilst simultaneously decreasing the Souths work force.