Few changes have taken place in our connections with the independent States of America since my last communication to Congress. The ratification of a commercial treaty with the United Republics of Mexico has been for some time under deliberation in their Congress, but was still undecided at the date of our last dispatches. The unhappy civil commotions that have prevailed there were undoubtedly the cause of the delay, but as the Government is now said to be tranquillized we may hope soon to receive the ratification of the treaty and an arrangement for the demarcation of the boundaries between us. In the mean time, an important trade has been opened with mutual benefit from St. Louis, in the State of Missouri, by caravans to the interior Provinces of Mexico. This commerce is protected in its progress through the Indian countries by the troops of the United States, which have been permitted to escort the caravans beyond our boundaries to the settled part of the Mexican territory. From Central America I have received assurances of the most friendly kind and a gratifying application for our good offices to remove a supposed indisposition toward that Government in a neighboring State. This application was immediately and successfully complied with. They gave us also the pleasing intelligence that differences which had prevailed in their internal affairs had been peaceably adjusted. Our treaty with this Republic continues to be faithfully observed, and promises a great and beneficial commerce between the two countries--a commerce of the greatest importance if the magnificent project of a ship canal through the dominions of that State from the Atlantic to the Pacific Ocean, now in serious contemplation, shall be executed. I have great satisfaction in communicating the success which has attended the exertions of our minister in Colombia to procure a very considerable reduction in the duties on our flour in that Republic. Indemnity also has been stipulated for injuries received by our merchants from illegal seizures, and renewed assurances are given that the treaty between the two countries shall be faithfully observed. Chili and Peru seem to be still threatened with civil commotions, and until they shall be settled disorders may naturally be apprehended, requiring the constant presence of a naval force in the Pacific Ocean to protect our fisheries and guard our commerce.