Samuel Nelson, The Collector v. Day — Opinion of the Court
“ And if the means and instrumentalities employed by that government to carry into operation the powers granted to it are, necessarily, and, for the sake of self-preservation, exempt from taxation by the States, why are not those of the States depending upon their reserved powers, for like reasons, equally exempt from Federal taxation? Their unimpaired existence in the one case is as essential as in the other. ”
