It's the 10th amendment. All other 9 amendments and many thereafter are in relation to human rights.

And states rights and human rights can actually go hand in hand, as seen by state legislatures that have passed assisted suicide, same-sex marriage, and legal cannabis laws. It has also been used to ensure electors cast their vote for the nominee or candidate who received the most votes from the people.

Unfortunately it's also been co-opted as a racist, misogynist dog whistle.