With the rapid expansion of commerce in the United States and the consequent necessity for regulation both by the State and the United States, no power of Congress was more frequently questioned than that to regulate commerce and no litigant concerned in such constitutional questions easily escaped the consequences of the varying interpretation given this clause by the United States Supreme Court. The court, of course, accepted as a general principle that there are three spheres for the regulation of commerce, namely: that which a State cannot invade, that which the State may invade, when Congress has not interfered, and that which is reserved to the State in conformity with its police power. But as late as 1886 the nationalistic school found some encouragement in the decision of the _Wabash, St. Louis and Pacific Railway Company_ v. _Illinois_[29] given by Justice Miller. He said: "Notwithstanding what is there said, that is, in the decisions of _Munn_ v. _Illinois; C. B. and Q. R. R. Company_ v. _Iowa_, and _Peik_ v. _Chicago and N. W. R. R. Co._,[30] this court held and asserted that it had never consciously held otherwise, that a statute of a State intended to regulate or to tax, or to impose any other restriction upon the transmission of persons or property or telegraphic messages, from one State to another, is not within the class of legislation which the States may enact in the absence of legislation by Congress; and that such statutes are void even as to the part of such transmission which may be within the State." Chief Justice Waite, and Justice Bradley and Justice Gray, however, dissented for various reasons.