By the cooperative conception of the federal relationship the States and the National Government are regarded as mutually complementary parts of a single governmental mechanism all of whose powers are intended to realize the current purposes of government according to their applicability to the problem in hand. This is the conception on which the recent social and economic legislation professes to rest. It is the conception which the Court invokes throughout its decisions in sustaining the Social Security Act of 1935 and supplementary state legislation. It is the conception which underlies congressional legislation of recent years making certain crimes against the States, like theft, racketeering, kidnapping, crimes also against the National Government whenever the offender extends his activities beyond state boundary lines. The usually cited constitutional justification for such legislation is that which was advanced forty years ago in the above quoted Hoke Case.[20]
It has been argued that the cooperative conception of the federal relationship, especially as it is realized in the policy of federal subventions to the States, tends to break down state initiative and to devitalize state policies. Actually, its effect has often been just the contrary, and for the reason pointed out by Justice Cardozo in Helvering _v._ Davis,[21] decided in 1937, namely, that the States, competing as they do with one another to attract investors, have not been able to embark separately upon expensive programs of relief and social insurance. Another great objection to Cooperative Federalism is more difficult to meet. This is, that Cooperative Federalism invites further aggrandizement of national power. Unquestionably it does, for when two cooperate, it is the stronger member of the combination who usually calls the tunes. Resting as it does primarily on the superior fiscal resources of the National Government, Cooperative Federalism has been, at least to date, a short expression for a constantly increasing concentration of power at Washington in the stimulation and supervision of local policies.[22]
The last element of the concept of Federalism to demand attention is the doctrine that the National Government is a government of enumerated powers only, and consequently under the necessity at all times of justifying its measures juridically by pointing to some particular clause or clauses of the Constitution which, when read separately or in combination, may be thought to grant power adequate to such measures. In spite of such recent decisions as that in United States _v._ Darby, this time-honored doctrine still guides the authoritative interpreters of the Constitution in determining the validity of acts which are passed by Congress in presumed exercise of its powers of domestic legislation--the course of reasoning pursued by the Chief Justice in the Darby Case itself is proof that such is the fact. In the field of foreign relations, on the contrary, the doctrine of enumerated powers has always had a difficult row to hoe, and today may be unqualifiedly asserted to be defunct.