I am not talking of distant history but of present time.
The US Supreme Court has used, after many other courts in the last ten or twenty years, this argument.
It was one of the arguments used in court against proposition 8 and we know this argument won.
I am not talking of slavery. I am talking of the modern world. When you add this principle of granted rights to Amendment 14, it is clear that this amendment reinforces this principle since everyone must be treated equal and protected equally.
A right, a freedom, a benefit, once given, to take it away would be negating Amendment 14.
Luckily we are no longer under slavery and the Ku Klux Klan is not — not yet some say — in the US Supreme Court.