Congressional districts of Texas and is represented in the House of Representatives.  The Senators from that State were chosen by a legislature in which the country west of that river was represented.  In view of all these facts it is difficult to conceive upon what ground it can be maintained that in occupying the country west of the Nueces with our Army, with a view solely to its security and defense, we invaded the territory of Mexico.  But it would have been still more difficult to justify the Executive, whose duty it is to see that the laws be faithfully executed, if in the face of all these proceedings, both of the Congress of Texas and of the United States, he had assumed the responsibility of yielding up the territory west of the Nueces to Mexico or of refusing to protect and defend this territory and its inhabitants, including Corpus Christi as well as the remainder of Texas, against the threatened Mexican invasion.

But Mexico herself has never placed the war which she has waged upon the ground that our Army occupied the intermediate territory between the Nueces and the Rio Grande.  Her refuted pretension that Texas was not in fact an independent state, but a rebellious province, was obstinately persevered in, and her avowed purpose in commencing a war with the United States was to reconquer Texas and to restore Mexican authority over the whole territory—­not to the Nueces only, but to the Sabine.  In view of the proclaimed menaces of Mexico to this effect, I deemed it my duty, as a measure of precaution and defense, to order our Army to occupy a position on our frontier as a military post, from which our troops could best resist and repel any attempted invasion which Mexico might make.  Our Army had occupied a position at Corpus Christi, west of the Nueces, as early as August, 1845, without complaint from any quarter.  Had the Nueces been regarded as the true western boundary of Texas, that boundary had been passed by our Army many months before it advanced to the eastern bank of the Rio Grande.  In my annual message of December last I informed Congress that upon the invitation of both the Congress and convention of Texas I had deemed it proper to order a strong squadron to the coasts of Mexico and to concentrate an efficient military force on the western frontier of Texas to protect and defend the inhabitants against the menaced invasion of Mexico.  In that message I informed Congress that the moment the terms of annexation offered by the United States were accepted by Texas the latter became so far a part of our own country as to make it our duty to afford such protection and defense, and that for that purpose our squadron had been ordered to the Gulf and our Army to take a “position between the Nueces and the Del Norte” or Rio Grande and to “repel any invasion of the Texan territory which might be attempted by the Mexican forces.”