The principles upon which the commercial policy of the United States is founded are to be traced to an early period. They are essentially connected with those upon which their independence was declared, and owe their origin to the enlightened men who took the lead in our affairs at that important epoch. They are developed in their first treaty of commerce with France of 6th February, 1778, and by a formal commission which was instituted immediately after the conclusion of their Revolutionary struggle, for the purpose of negotiating treaties of commerce with every European power. The first treaty of the United States with Prussia, which was negotiated by that commission, affords a signal illustration of those principles. The act of Congress of the 3d March. 1815. adopted immediately after the return of a general peace, was a new overture to foreign nations to establish our commercial relations with them on the basis of free and equal reciprocity. That principle has pervaded all the acts of Congress and all the negotiations of the Executive on the subject since.

A convention for the settlement of important questions in relation to the northwest coast of this continent and its adjoining seas was concluded and signed at St. Petersburg on the 5th day of April last by the minister plenipotentiary of the United States and plenipotentiaries of the Imperial Government of Russia. It will immediately be laid before the Senate for the exercise of the constitutional authority of that body with reference to its ratification. It is proper to add that the manner in which this negotiation was invited and conducted on the part of the Emperor has been very satisfactory.

The great and extraordinary changes which have happened in the Governments of Spain and Portugal within the last two years, without seriously affecting the friendly relations which under all of them have been maintained with those powers by the United States, have been obstacles to the adjustment of the particular subjects of discussion which have arisen with each. A resolution of the Senate adopted at their last session called for information as to the effect produced upon our relations with Spain by the recognition on the part of the United States of the independent South American Governments. The papers containing that information are now communicated to Congress.

A chargé d'affaires has been received from the independent Government of Brazil. That country, heretofore a colonial possession of Portugal, had some years since been proclaimed by the Sovereign of Portugal himself an independent Kingdom. Since his return to Lisbon a revolution in Brazil has established a new Government there with an imperial title, at the head of which is placed a prince, in whom the regency had been vested by the King at the time of his departure. There is reason to expect that by amicable negotiation the independence of Brazil will ere long be recognized by Portugal herself.

With the remaining powers of Europe, with those on the coast of Barbary, and with all the new South American States our relations are of a friendly character. We have ministers plenipotentiary residing with the Republics of Colombia and Chile, and have received ministers of the same rank from Colombia, Guatemala, Buenos Ayres, and Mexico. Our commercial relations with all those States are mutually beneficial and increasing. With the Republic of Colombia a treaty of commerce has been formed, of which a copy is received and the original daily expected. A negotiation for a like treaty would have been commenced with Buenos Ayres had it not been prevented by the indisposition and lamented decease of Mr. Rodney, our minister there, and to whose memory the most respectful attention has been shewn by the Government of that Republic. An advantageous alteration in our treaty with Tunis has been obtained by our consular agent residing there, the official document of which when received will be laid before the Senate.

The attention of the Government has been drawn with great solicitude to other subjects, and particularly to that relating to a state of maritime war, involving the relative rights of neutral and belligerent in such wars. Most of the difficulties which we have experienced and of the losses which we have sustained since the establishment of our independence have proceeded from the unsettled state of those rights and the extent to which the belligerent claim has been carried against the neutral party. It is impossible to look back on the occurrences of the late wars in Europe, and to behold the disregard which was paid to our rights as a neutral power, and the waste which was made of our commerce by the parties to those wars by various acts of their respective Governments, and under the pretext by each that the other had set the example, without great mortification and a fixed purpose never to submit to the like in future. An attempt to remove those causes of possible variance by friendly negotiation and on just principles which should be applicable to all parties could, it was presumed, be viewed by none other than as a proof of an earnest desire to preserve those relations with every power. In the late war between France and Spain a crisis occurred in which it seemed probable that all the controvertible principles involved in such wars might be brought into discussion and settled to the satisfaction of all parties. Propositions having this object in view have been made to the Governments of Great Britain, France, Russia, and of other powers, which have been received in a friendly manner by all, but as yet no treaty has been formed with either for its accomplishment. The policy will, it is presumed, be persevered in, and in the hope that it may be successful.

It will always be recollected that with one of the parties to those wars, and from whom we received those injuries, we sought redress by war. From the other, by whose then reigning Government our vessels were seized in port as well as at sea and their cargoes confiscated, indemnity has been expected, but has not yet been tendered. It was under the influence of the latter that our vessels were likewise seized by the Governments of Spain, Holland, Denmark, Sweden, and Naples, and from whom indemnity has been claimed and is still expected, with the exception of Spain, by whom it has been rendered. With both parties we had abundant cause of war, but we had no alternative but to resist that which was most powerful at sea and pressed us nearest at home. With this all differences were settled by a treaty, founded on conditions fair and honorable to both, and which has been so far executed with perfect good faith. It has been earnestly hoped that the other would of its own accord, and from a sentiment of justice and conciliation, make to our citizens the indemnity to which they are entitled, and thereby remove from our relations any just cause of discontent on our side.

It is estimated that the receipts into the Treasury during the current year, exclusive of loans, will exceed $18,500,000, which, with the sum remaining in the Treasury at the end of the last year, amounting to $9.463,922.81, will, after discharging the current disbursements of the year, the interest on the public debt, and upward of $11,633,011.52 of the principal, leave a balance of more than $3,000,000 in the Treasury on the 1st day of January next.

A larger amount of the debt contracted during the late war, bearing an interest of 6 per cent, becoming redeemable in the course of the ensuing year than could be discharged by the ordinary revenue, the act of the 26th of May authorized a loan of $5,000,000 at 4-1/2 per cent to meet the same. By this arrangement an annual saving will accrue to the public of $75,000.

Under the act of the 24th of May last a loan of $5,000,000 was authorized, in order to meet the awards under the Florida treaty, which was negotiated at par with the Bank of the United States at 4-1/2 percent, the limit of interest fixed by the act. By this provision the claims of our citizens who had sustained so great a loss by spoliations, and from whom indemnity had been so long withheld, were promptly paid. For these advances the public will be amply repaid at no distant day by the sale of the lands in Florida. Of the great advantages resulting from the acquisition of the Territory in other respects too high an estimate can not be formed.