I'm taking a real human to be one with legal protections and the rights to life, liberty and the pursuit of happiness.
My source is the Constitution.
Okay, two problems here. One, the Constitution doesn't define "real human" anywhere in it, nor does it ever mention life, liberty, and the pursuit of happiness. That would be the Declaration of Independence. So please explain to me how your source for a "real human being" definition can POSSIBLY be the US Constitution.
Second problem is, if one must have legal protections to be a "real human being", does that mean that slaves were not real human beings prior to emancipation and the end of the War Between the States, and somehow real humanity was magically conveyed upon them at that point? Because I gotta say, that Abraham Lincoln didn't know his own strength, if that was the case. Someone should nominate that man for canonization, pulling off a miracle like that!
So it WAS emancipation that magically conveyed "real human being" status on the slaves.
The only question that remains then is what they were before Congress and the President magically made them into humans.