Persevering efforts have been made for the adjustment of the claims of American citizens against the Government of Costa Rica, and I am happy to inform you that these have finally prevailed. A convention was signed at the city of San Jose on the 2d July last, between the minister resident of the United States in Costa Rica and the plenipotentiaries of that Republic, referring these claims to a board of commissioners and providing for the payment of their awards. This convention will be submitted immediately to the Senate for their constitutional action. The claims of our citizens upon the Republic of Nicaragua have not yet been provided for by treaty, although diligent efforts for this purpose have been made by our minister resident to that Republic. These are still continued, with a fair prospect of success. Our relations with Mexico remain in a most unsatisfactory condition. In my last two annual messages I discussed extensively the subject of these relations, and do not now propose to repeat at length the facts and arguments then presented. They proved conclusively that our citizens residing in Mexico and our merchants trading thereto had suffered a series of wrongs and outrages such as we have never patiently borne from any other nation. For these our successive ministers, invoking the faith of treaties, had in the name of their country persistently demanded redress and indemnification, but without the slightest effect. Indeed, so confident had the Mexican authorities become of our patient endurance that they universally believed they might commit these outrages upon American citizens with absolute impunity. Thus wrote our minister in 1856, and expressed the opinion that "nothing but a manifestation of the power of the Government and of its purpose to punish these wrongs will avail." Afterwards, in 1857, came the adoption of a new constitution for Mexico, the election of a President and Congress under its provisions, and the inauguration of the President. Within one short month, however, this President was expelled from the capital by a rebellion in the army, and the supreme power of the Republic was assigned to General Zuloaga. This usurper was in his turn soon compelled to retire and give place to General Miramon. Under the constitution which had thus been adopted Señor Juarez, as chief justice of the supreme court, became the lawful President of the Republic, and it was for the maintenance of the constitution and his authority derived from it that the civil war commenced and still continues to be prosecuted.