There certainly is a lot of political pressure for states to adopt the new federal tax codes. But there is no law that requires them to do so.
“Always when you go to a new country and they teach you bad words, you just say them without knowing the value and people look at you because you didn't know that value of them.”
“The white man's blood and bones have begotten this bronze race, and bequeathed to it in some degree qualities, tendencies, capabilities, such as are the inheritance of the highest order of human animals.”