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.
Only 3/5 human. Also, property.
Your Constitutional scholarship rivals your biological and medical learning.
The Constitution never said anyone was" 3/5 human". The Enumeration Clause, dealing with how Representatives are apportioned, says this:
". . . which shall be determined by adding to the whole Number of free Persons, including those bound to Service for a Term of Years, and excluding Indians not taxed, three fifths of all other Persons."
Doesn't say a damned thing about anyone being a fraction of a human, or even a fraction of a person.
Property, on the other hand, they definitely WERE. That, however, has nothing to do with whether or not they were "real human beings". So again, if they weren't humans until the Civil Rights Act magically conveyed humanity upon them, what sort of animal were they? Or perhaps they were insects? Plants?