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 claiming lands under grants of different States. Cases of this sort involve questions of the sovereign power of the States, and could not, with any show of propriety, be entrusted to the decision of either of them, interested as it would be to sustain its own acts, against those of the sister State. The jurisdiction in this case is given upon the same principles which give it in cases between two or more States.

Controversies between a State or the citizens thereof, and foreign States, citizens or subjects, depend on a different principle, but one equally affecting the common rights and interests of all the States. A foreign State cannot, of course, be sued; she can appear in our courts only as plaintiff. Yet, in whatever form such controversies, or those affecting the citizens of a foreign State, may arise, all the States have a deep interest that an impartial tribunal, satisfactory to the foreign party, should be provided. The denial of justice is a legitimate, and not an unfruitful cause of war. As no State can be involved in war without involving all the rest, they all have a common interest to withdraw from the State tribunals a jurisdiction which may bring them within the danger of that result. All the States are alike bound to render justice to foreign States and their people; and this common responsibility gives them a right to demand that every question involving it shall be decided by their common judicatory.

This brief review of the judicial power of the United States, as given in the Constitution, is not offered as a full analysis of the subject; for the question before us does not render any such analysis necessary. My design has been only to show with what extreme reserve judicial power has been conferred, and with what caution it has been restricted to those cases, only, which the new relation between the States, established by the Constitution, rendered absolutely *necessary. In all the cases above supposed, the jurisdiction of the federal courts is clear and undoubted; and as the States have, in the frame of the Constitution, agreed to submit to the exercise of this jurisdiction, they are bound to do so, and to compel their people to like submission. But it is to be remarked, that they are bound only by their agreement, and not beyond it. They are under no obligation to submit to the decisions of the supreme