For many purposes, the States are independent sovereigns and not under Federal control. They have lost the powers which the people in the Constitution gave to the Central Government; but in the field of powers left to them each is supreme within its own limits, and by the exercise of that power may trespass on the exercise of similar power by its neighbor. How is such a conflict to be settled? It may be by diplomacy, i.e., by negotiation and compromise agreement, but this under the Constitution must be with the consent of Congress. It might be settled by war, but the Constitution forbids. And the State invaded by the forces of another State can appeal to the General Government to resist and suppress the invasion, no matter what the merits of the quarrel. In other words, one of the attributes of sovereignty and independence which the people in ordaining the Constitution took away from the States was the unlimited power to make agreements between each other as to their respective rights, and the other was that of making war on each other when other means of settlement failed. What did the people through the Constitution substitute for these attributes of unrestricted diplomatic negotiation and compromise and the right to go to war over such interstate issues? The right of the complaining State to hale the offending State before the Supreme Court and have the issue decided by a binding judgment. Now, can the complaining State bring every issue between it and another State before the Supreme Court? No. The only issues which the Court can hear and decide are questions which in their nature are capable of judicial solution. Mr. Justice Bradley first called such questions “justiciable,” and Chief Justice Fuller and Mr. Justice Brewer used the same term. There are issues between States of a character which would be likely to lead to high feeling and to war if they arose between independent sovereignties, and which the Supreme Court cannot decide because they are not capable of judicial solution. In such cases between States of course there can be no war, because the Federal Government would suppress it. Therefore, if an amicable understanding cannot be reached, the States are left with an unsettled dispute between them and no way of deciding it. They must put up with the existing state of things.