Federal reciprocity law like DL
The Feds should not have a CCW.
But the principle of Constitutionally recognizing the legal acts of one state by another state [your DL is valid anywhere and your marriage license too] says that the feds should mandate that all states must recognize a valid license from any other state.
That would make Illinois and Wisconsin accessible and it also means that CA, NY and HI would have to recognize a valid license.
There also should not be a waiting period before a US citizen can apply for a CCH, many states place a 6 month residency requirement on top of being a US citizen, that seems to be a denial of a basic civil right.