Tom C. Clark,
Northwestern States Portland Cement Company v…
“ We believe that the rationale of these cases, involving income levies by States, controls the issues here. The taxes are not regulations in any sense of that term. Admittedly they do not discriminate against nor subject either corporation to an undue burden. While it is true that a State may not erect a wall around its borders preventing commerce an entry, it is axiomatic that the founders did not intend to immunize such commerce from carrying its fair share of the costs of the state government in return for the benefits it derives from within the State. ”
