There were great differences of opinion in the Convention upon the expediency of giving to the judges, as expositors of the Constitution, power to declare a law to be void;[358] and undoubtedly such a power, if introduced into some governments, would be legislative in its nature, whether the persons who were to exercise it should be called judges, or be clothed with the functions of a council of revision. But under a limited and written constitution, such a power, when given in the form and exercised in the mode provided for in the Constitution of the United States, is strictly judicial. This is apparent from the question that is to be determined. It arises in a judicial controversy respecting some right asserted by or against an individual; and the matter to be determined is whether an act of legislation, supposed to govern the case as law, is itself in conformity to the supreme law of the Constitution. In a government constituted like ours, this question must be determined by some one of its departments. If it be left with the executive to decide finally what laws shall be executed, because they are consistent with the Constitution, and what laws shall be suspended, because they violate the Constitution, this practical inconvenience may arise, namely, that the decision is made upon the abstract question, before a case to be governed by the law has arisen. If the legislature were empowered to determine, finally, that the laws which they enact are constitutional, the same practical difficulty would exist; and the individual, whose rights or interests may be affected by a law, when put into operation, would have no opportunity to be heard upon what in our form of government is a purely juridical question, on which every citizen should be heard, if he desires it, before the law is enforced in his case. On the other hand, if the final and authoritative determination is postponed until the question arises in the course of a judicial controversy respecting some right or duty or power of an individual who is to be affected by the law, or who acts under it, the question itself is propounded not in the abstract, but in the concrete; not in reference to the bearing of the law upon all possible cases, but to its bearing upon the facts of a single case. In this aspect, the question is of necessity strictly judicial. To withhold from the citizen a right to be heard upon the question which in our jurisprudence is called the constitutionality of a law, when that law is supposed to govern his rights or prescribe his duties, would be as unjust as it would be to deprive him of the right to be heard upon the construction of the law, or upon any other legal question that arises in the cause. The citizen lives under the protection, and is subject to the requirements, of a written fundamental law. No department of the national, or of any State government, can lawfully act otherwise than according to the powers conferred or the restrictions imposed by that instrument. If the citizen believe himself to be aggrieved by some action of either government which he supposes to be in violation of the Constitution, and his complaint admit of judicial investigation, he must be heard upon that question, and it must be adjudicated, or there can be no administration of the laws worthy of the name of justice.

It is interesting, therefore, to observe how this function of the judicial power gives to the operation of the government a comparatively high degree of simplicity, exactness, and directness, notwithstanding the refined and complex character of the system which its framers were obliged to establish. To judge of the merits of that system, in this particular, it is necessary to recur again to those alternative measures, to which I have frequently referred, and which lay directly in their path. One of these measures was that of a council of revision, to be charged with the duty of arresting improper laws. Besides the objection which has been already alluded to,—that the question of the conformity of a law to the Constitution would have thus been finally passed upon in the abstract,—such an institution, although theoretically confined to this inquiry, would have become practically a third legislative chamber; for it would inevitably have happened that considerations of expediency would also have found their way into the deliberations of a numerous body appointed to exercise a revisory power over all acts of legislation. There is no mode in which the question of constitutional power to enact a law can be determined, without the influence of considerations of policy or expediency, so effectually, as by confining the final determination to the special operation of the law upon the facts of an individual case. When the tribunal that is to decide this question is, by the very form in which it is required to act, limited to the bearing of the law upon some right or duty of an individual placed in judgment by a record, it is at once relieved of the responsibility, and in a great degree freed from the temptation, of considering the policy of the legislation. If, therefore, it be conceded—as every one will concede—that, whatever public body is specially instituted for the purpose of submitting the acts of the legislature to the test of the Constitution, it should neither possess the power, nor be exposed to the danger, of invading the legislative province, by acting upon motives of expediency, it must be allowed that the framers of the Constitution did wisely in rejecting the artificial, cumbrous, and hazardous project of a council of revision. The plan of such a council was, it is true, much favored, and indeed insisted upon, by some of the wisest men in the Convention. But it was urged at a time when the negative that was to be given to the President had not been settled, and when he had not been made sufficiently independent of the legislature to insure his unfettered employment of the negative that might be given to him. The purpose of the proposed council of revision was to strengthen his hands, by uniting the judges with him in the exercise of the "veto." This would have given to the judges a control both over the question of constitutional power and the question of legislative policy. As to the latter, it became unnecessary, as well as inexpedient, to unite the judges with the President, after he had been clothed with a suitable negative, and after his election had been taken from the legislature; and as to the former question, the final arrangement of the judicial power made it equally unnecessary to form the judges into a council of revision, since, if the President should fail to arrest an unconstitutional law, when presented for his approval, it could be tested in the ordinary course of judicial proceedings after it had gone into operation.

But the conformity of laws of Congress to the Constitution was not all that was to be secured. Some prudent and effectual means were to be devised, by which the acts of the State governments could be subjected to the same test. The project of submitting the laws of the States to some department of the general government, while they were in the process of being enacted, or before they could have the form of law, was full of inconvenience and hazard. It could not have been attempted without an injury to State pride, that would have aroused an inextinguishable opposition to the national authority, even if the plan could once have been assented to. Yet there was no other alternative, unless the judicial power of the general government should be so constructed as to enable it to take the same cognizance of a constitutional question, when arising upon the law of a State, that it was to take of such a question when arising upon an act of Congress. The same necessity would exist in the one case, as in the other, for a power within the general government to give practical effect to that supremacy which the Constitution was to claim for itself, for treaties, and for the laws passed in pursuance of its provisions. All the restrictions which the Constitution was to lay upon the powers of the States would be nugatory, if the States themselves were to be the final judges of their meaning and operation. This transcendent power of interpretation and application, so logically necessary, and yet so certain to wound and irritate, if exercised by direct interference, could be wielded, without injurious results, through the agency of judicial forms, by a judicial investigation into personal rights, when affected by the action of a State government, just as it could be in reference to the acts of any department of the national government that could be made the subject of proceedings in a court of justice.

The relation of the judicial power to the execution of treaties rests upon the same grounds of paramount necessity. It is not merely for the sake of uniformity of interpretation, that the national judiciary is authorized to decide finally all cases arising under treaties, although uniformity of interpretation is essential to the preservation of the public faith; but it is in order that the treaty shall be executed, by being placed beyond the hazards both of wrong construction and of interested opposition. The memorable instance of the Treaty of Peace, the absolute failure of which in point of execution, before the adoption of the Constitution, has been described in the first volume of this work, presents the great illustration, in our constitutional history, of the only mode in which the supremacy of treaty stipulations as law can be maintained in our system of government. "The United States in Congress assembled," under the Confederation, had the same exclusive authority to make treaties that is now possessed by the President and the Senate under the Constitution, and a treaty was in theory as obligatory then, upon the separate States and their inhabitants, as it is now. But it has been found to be an axiom of universal application in the art of government, that a supremacy which is merely theoretical is no real supremacy. If a stipulation made by the proper authority with a foreign government is to have the force of law, requiring the obedience of individuals and of all public authorities, its execution must be committed to a judiciary acting upon private rights without the hinderance or influence of adverse legislation.

There is another branch of the judicial power which illustrates in a striking manner the object embraced in the preamble of the Constitution, where the people of the United States declare it to be their purpose "to establish justice." This is found in the provision for a special jurisdiction over the rights of persons bearing a certain character. Like almost everything else in the Constitution, this feature of the judicial power sprang from a necessity taught by previous and severe experience. Reasoning from the mere nature of such a government as that of the United States, it might seem that the judicatures of the separate States would be sufficient for the administration of justice in all cases in which private rights alone are concerned, and by which no power or interest of the general government, and no provision of the general Constitution, is likely to be affected. But we find in the judicial power of the United States a particular jurisdiction given on account of the mere civil characters of the parties to a controversy; and its existence there is to be accounted for upon other than speculative reasons. From the Declaration of Independence to the day of the ratification of the Constitution, the judicial tribunals of the States had been unable to administer justice to foreigners, to citizens of other States, to foreign governments and their representatives, and to the governments of their sister States, so as to command the confidence and satisfy the reasonable expectations of an enlightened judgment. Hence the necessity for opening the national courts to these various classes of parties, whose different positions may now be briefly considered.

In a country of confederated States, each possessing a full power of legislation, it could not but happen—as it did constantly happen in this Union before the adoption of the Constitution—that the determination of controversies between citizens of the State where the adjudication was to be had, and citizens of another State, would be exposed to influences unfavorable to the ends of justice. In truth, one of the parties in such a controversy was virtually an alien, in the tribunal which he was obliged to enter; for although the Articles of Confederation undertook to secure to the free inhabitants of each State all the privileges and immunities of free citizens in the several States, yet it is obvious that the efficacy of such a provision must depend almost wholly upon the spirit of the tribunals, and upon their capacity to give effect to such a declaration of rights, against a course of State policy or the positive enactments of a State code. The chief difficulty of the condition of affairs existing before the Constitution lay not so much in the hazards of a violation of principle through local prejudice, or the superior force of local policy or legislation,—although these influences were always powerful,—as in the fact that, when these influences were likely to be most active, or were most feared, there was no tribunal to which resort could be had, and which was known to be beyond their operation and their reach. The articles of compact between the States had intended to remove from the citizens of the different States the disabilities of practical alienage under which they would have stood in the tribunals of each other. But with that mere declaration those articles stopped. If the litigant saw that the local law was likely to be administered to him as if he were a foreigner, or feared that the scales of justice would not be held with an impartial hand, he could go nowhere else for a decision. This was a great evil; for much of the value of every judicature depends upon the confidence it inspires.

There were still other and perhaps stronger reasons for creating an independent jurisdiction, to be resorted to by foreigners, in controversies with citizens of the States. No clause in the Constitution was to make them equal in rights with citizens, and for the very reason of their alienage, therefore, it was necessary to give them access to tribunals organized under the authority of the general government, which would be responsible to foreign powers for the treatment that their subjects might receive in the United States. Ambassadors, too, and other foreign ministers, would not only be aliens, but would possess the character of representatives of their sovereigns; and consuls would be the public agents of their governments, although not bearing the diplomatic character. These functionaries were therefore permitted to resort to the judicial power of the United States; and for the purpose of more effectually protecting the national interests that might be involved in their personal or official relations, original jurisdiction was given to the Supreme Court in all cases affecting them.

In addition to these, there were other controversies, which, as we have seen, were included within the judicial power of the United States, on account of the character of the parties; namely, those to which the United States might be a party; those to which a State of the Union might be a party, where the opposite party was another State of the Union, or a citizen of another State of the Union, or a foreign state or its citizens or subjects; and those between citizens of a State of the Union, and foreign states, citizens, or subjects. Finally, controversies between citizens of the same State claiming lands under grants of different States were placed under the same jurisdiction for similar reasons;—because the State tribunals could not be expected to afford that degree of impartiality which the circumstances of these several cases required.

There remains only one other branch of the jurisdiction conferred by the Constitution on the tribunals of the United States which it is necessary to notice; namely, the admiralty and maritime jurisdiction. With respect to the criminal jurisdiction in admiralty, in cases of piracies and felonies committed on the high seas, and the prize jurisdiction, the Articles of Confederation had given to the Congress the exclusive power of appointing courts for the trial of the former, and for hearing and finally determining appeals in all cases of capture. Such appeals were taken from the State courts of admiralty,—tribunals which also possessed and exercised a civil jurisdiction corresponding to that of the admiralty in England, but in practice somewhat more extensive. When the Constitution was framed, it was perceived to be expedient, on account of the relation of maritime commerce to the intercourse of the people of the United States with foreign nations, or to the intercourse of the people of different States with each other, to give the whole civil as well as criminal jurisdiction in admiralty, and the entire prize jurisdiction, original as well as appellate, to the government of the Union. This was effected by the comprehensive provision, which gives the judicial power cognizance of "all cases of admiralty and maritime jurisdiction"; expressions which have often been, and are still likely to be, the subject of much forensic controversy with respect to the particular transactions, of a civil nature, intended to be embraced in the jurisdiction, but in reference to which there is nothing in the known proceedings of the Convention, other than what is to be inferred from the language selected, that affords any special evidence of the intention of the framers of the Constitution.