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 charge 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 Columbia, 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.