[elbucko]

And some want to use the "States Rights" argument to support their claim.

Yes. Unfortunately this was the instrument to enslave blacks and later protect "Jim Crow" laws. Too bad. "States Rights" could have been an excellent tool to keep the Federal Gov't. in check.

[Abcdefg]

As far as I understand it, there has never been any such thing as "state's rights".
Only people have rights and states (or States) have powers. Take a read of the Constitution and you will not see a mention of rights held by government, only powers.