In other words, it isnt enshrined at all, in all of the US. Wake up man...force is useless unless it can or will be applied. Theoretically, yes you can carry a gun in the US. Theoretically, yes, your home is your castle. Practically though, in the US of today, if you use that gun against the wrong person at the wrong time you will be in so much trouble cf George Zimmerman. Self-defence was criminilized for him too wasn’t it?
It’s enshrined in the Constitution.
You know, the one we wrote after revolting against our colonial masters.