Emancipated thoughts

...why was it called the "emancipation proclamation?"
why didn't they call it the "liberation proclamation," "the freedom declaration," or the like?
Etymologize the word "emancipation" and you find in its Latin roots ideas that speak of transferring ownership. The Romans used another word to speak of freeing one from slavery: manumission. So... why wasn't it the "Manumission proclamation"...
If certain people were property at the time, and the title of their ownership shifted from a privatized system (southern plantation owners) to a public system (prisons and debt slavery), could that be considered "emancipation"?
Just questions...
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