Cain reads it the same way SCOTUS Justices Thomas, Scalia and Alito read it, the States have authority to enact reasonable resrtrictions on firearms like permits to carry or discharging in public. This is the Conservative position. If you believe the states do not have such authority, you are far outside of mainstream conservative thinking, more in the realm of libertarians or anarchists.
What was the Bill of Rights written for, the Federal Government (Congress), the states, or both? Your knowledge or naivete in on the line in answering this question, so be careful.
“Where does it say that in the second amendment?”
The part about where powers not granted to the Federal govt.
The second amendment is all about the right of self-defense. Certainly defensive fortifications should not be objected to, right?