The known desire of the Texans to become a part of our system, although its gratification depends upon the reconcilement of various and conflicting interests, necessarily a work of time and uncertain in itself, is calculated to expose our conduct to misconstruction in the eyes of the world. There are already those who, indifferent to principle themselves and prone to suspect the want of it in others, charge us with ambitious designs and insidious policy. You will perceive by the accompanying documents that the extraordinary mission from Mexico has been terminated on the sole ground that the obligations of this Government to itself and to Mexico, under treaty stipulations, have compelled me to trust a discretionary authority to a high officer of our Army to advance into territory claimed as part of Texas if necessary to protect our own or the neighboring frontier from Indian depredation. In the opinion of the Mexican functionary who has just left us, the honor of his country will be wounded by American soldiers entering, with the most amicable avowed purposes, upon ground from which the followers of his Government have been expelled, and over which there is at present no certainty of a serious effort on its part to re-establish its dominion. The departure of this minister was the more singular as he was apprised that the sufficiency of the causes assigned for the advance of our troops by the commanding general had been seriously doubted by me, and there was every reason to suppose that the troops of the United States, their commander having had time to ascertain the truth or falsehood of the information upon which they had been marched to Nacogdoches, would be either there in perfect accordance with the principles admitted to be just in his conference with the Secretary of State by the Mexican minister himself, or were already withdrawn in consequence of the impressive warnings their commanding officer had received from the Department of War. It is hoped and believed that his Government will take a more dispassionate and just view of this subject, and not be disposed to construe a measure of justifiable precaution, made necessary by its known inability in execution of the stipulations of our treaty to act upon the frontier, into an encroachment upon its rights or a stain upon its honor. In the mean time the ancient complaints of injustice made on behalf of our citizens are disregarded, and new causes of dissatisfaction have arisen, some of them of a character requiring prompt remonstrance and ample and immediate redress. I trust, however, by tempering firmness with courtesy and acting with great forbearance upon every incident that has occurred or that may happen, to do and to obtain justice, and thus avoid the necessity of again bringing this subject to the view of Congress.