Laws are a dead letter without courts to expound and define their true meaning and operation. The treaties of the United States, to have any force at all, must be considered as part of the law of the land. Their true import, as far as respects individuals, must, like all other laws, be ascertained by judicial determinations. To produce uniformity in these determinations, they ought to be submitted, in the last resort, to one SUPREME TRIBUNAL. And this tribunal ought to be instituted under the same authority which forms the treaties themselves. These ingredients are both indispensable. If there is in each State a court of final jurisdiction, there may be as many different final determinations on the same point as there are courts. There are endless diversities in the opinions of men. We often see not only different courts but the judges of the came court differing from each other. To avoid the confusion which would unavoidably result from the contradictory decisions of a number of independent judicatories, all nations have found it necessary to establish one court paramount to the rest, possessing a general superintendence, and authorized to settle and declare in the last resort a uniform rule of civil justice.