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.