BAKER v. CARR.
186
Opinion of the Court.
tion of the Subject Matter" we hold only that the matter
set forth in the complaint does arise under the Constitution and is within 28 U. S. C. § 1343.
Article III, § 2, of the Federal Constitution provides
that "The judicial Power shall extend to all Cases, in Law
and Equity, arising under this Constitution, the Laws of
the United States, and Treaties made, or which shall be
made, under their Authority . . . ." It is clear that the
cause of action is one which "arises under" the Federal
Constitution. The complaint alleges that the 1901 statute effects an apportionment that deprives the appellants
of the equal protection of 'the laws in violation of the
Fourteenth Amendment. Dismissal of the complaint
upon the ground of lack of jurisdiction of the subject
matter would, therefore, be justified only if that claim
were "so attenuated and unsubstantial as to be absolutely
devoid of merit," Newburyport Water Co. v. Newburyport, 193 U. S. 561, 579, or "frivolous," Bell v. Hood, 327
U. S. 678, 683.1' That the claim is unsubstantial must be
"very plain." Hart v. Keith Vaudeville Exchange, 262
U. S. 271, 274. Since the District Court obviously and
correctly did not deem the asserted federal constitutional
claim unsubstantial and frivolous, it should not have dismissed the complaint for want of jurisdiction of the subject matter. And of course no further consideration of the
merits of the claim is relevant to a determination of the
court's jurisdiction of the subject matter. We said in
an earlier voting case from Tennessee: "It is obvious . . .
that the court, in dismissing for want of jurisdiction, was
controlled by what it deemed to be the want of merit in
the averments which were made in the complaint as to
the violation of the Federal right. But as the very
nature of the controversy was Federal, and, therefore,
17 The accuracy of calling even such dismissals "jurisdictional" was
questioned in Bell v. Hood. See 327 U. S., at 683.