A Compilation of the Messages and Papers of the Presidents. Volume 4, part 3: James Knox Polk

by Unknown

The temporary governments authorized were instituted by virtue of the rights of war. The power to declare war against a foreign country, and to prosecute it according to the general laws of war, as sanctioned by civilized nations, it will not be questioned, exists under our Constitution. When Congress has declared that war exists with a foreign nation, "the general laws of war apply to our situation," and it becomes the duty of the President, as the constitutional "Commander in Chief of the Army and Navy of the United States," to prosecute it.

In prosecuting a foreign war thus duly declared by Congress, we have the right, by "conquest and military occupation," to acquire possession of the territories of the enemy, and, during the war, to "exercise the fullest rights of sovereignty over it." The sovereignty of the enemy is in such case "suspended," and his laws can "no longer be rightfully enforced" over the conquered territory "or be obligatory upon the inhabitants who remain and submit to the conqueror. By the surrender the inhabitants pass under a temporary allegiance" to the conqueror, and are "bound by such laws, and such only, as" he may choose to recognize and impose. "From the nature of the case, no other laws could be obligatory upon them, for where there is no protection or allegiance or sovereignty there can be no claim to obedience." These are well-established principles of the laws of war, as recognized and practiced by civilized nations, and they have been sanctioned by the highest judicial tribunal of our own country.

The orders and instructions issued to the officers of our Army and Navy, applicable to such portions of the Mexican territory as had been or might be conquered by our arms, were in strict conformity to these principles. They were, indeed, ameliorations of the rigors of war upon which we might have insisted. They substituted for the harshness of military rule something of the mildness of civil government, and were not only the exercise of no excess of power, but were a relaxation in favor of the peaceable inhabitants of the conquered territory who had submitted to our authority, and were alike politic and humane.

It is from the same source of authority that we derive the unquestioned right, after the war has been declared by Congress, to blockade the ports and coasts of the enemy, to capture his towns, cities, and provinces, and to levy contributions upon him for the support of our Army. Of the same character with these is the right to subject to our temporary military government the conquered territories of our enemy. They are all belligerent rights, and their exercise is as essential to the successful prosecution of a foreign war as the right to fight battles.

New Mexico and Upper California were among the territories conquered and occupied by our forces, and such temporary governments were established over them. They were established by the officers of our Army and Navy in command, in pursuance of the orders and instructions accompanying my message to the House of Representatives of December 22, 1846. In their form and detail, as at first established, they exceeded in some respects, as was stated in that message, the authority which had been given, and instructions for the correction of the error were issued in dispatches from the War and Navy Departments of the 11th of January, 1847, copies of which are herewith transmitted. They have been maintained and supported out of the military exactions and contributions levied upon the enemy, and no part of the expense has been paid out of the Treasury of the United States.

In the routine of duty some of the officers of the Army and Navy who first established temporary governments in California and New Mexico have been succeeded in command by other officers, upon whom light duties devolved; and the agents employed or designated by them to conduct the temporary governments have also, in some instances, been superseded by others. Such appointments for temporary civil duty during our military occupation were made by the officers in command in the conquered territories, respectively.

On the conclusion and exchange of ratifications of a treaty of peace with Mexico, which was proclaimed on the 4th instant, these temporary governments necessarily ceased to exist. In the instructions to establish a temporary government over New Mexico, no distinction was made between that and the other Provinces of Mexico which might be conquered and held in our military occupation.

The Province of New Mexico, according to its ancient boundaries, as claimed by Mexico, lies on both sides of the Rio Grande. That part of it on the east of that river was in dispute when the war between the United States and Mexico commenced. Texas, by a successful revolution in April, 1836, achieved, and subsequently maintained, her independence. By an act of the Congress of Texas passed in December, 1836, her western boundary was declared to be the Rio Grande from its mouth to its source, and thence due north to the forty-second degree of north latitude. Though the Republic of Texas, by many acts of sovereignty which she asserted and exercised, some of which were stated in my annual message of December, 1846, had established her clear title to the country west of the Nueces, and bordering upon that part of the Rio Grande which lies below the Province of New Mexico, she had never conquered or reduced to actual possession and brought under her Government and laws that part of New Mexico lying east of the Rio Grande, which she claimed to be within her limits. On the breaking out of the war we found Mexico in possession of this disputed territory. As our Army approached Sante Fe (the capital of New Mexico) it was found to be held by a governor under Mexican authority, with an armed force collected to resist our advance. The inhabitants were Mexicans, acknowledging allegiance to Mexico. The boundary in dispute was the line between the two countries engaged in actual war, and the settlement of it of necessity depended on a treaty of peace. Finding the Mexican authorities and people in possession, our forces conquered them, and extended military rule over them and the territory which they actually occupied, in lieu of the sovereignty which was displaced. It was not possible to disturb or change the practical boundary line in the midst of the war, when no negotiation for its adjustment could be opened, and when Texas was not present, by her constituted authorities, to establish and maintain government over a hostile Mexican population who acknowledged no allegiance to her. There was, therefore, no alternative left but to establish and maintain military rule during the war over the conquered people in the disputed territory who had submitted to our arms, or to forbear the exercise of our belligerent rights and leave them in a state of anarchy and without control.

Whether the country in dispute rightfully belonged to Mexico or to Texas, it was our right in the first case, and our duty as well as our right in the latter, to conquer and hold it. Whilst this territory was in our possession as conquerors, with a population hostile to the United States, which more than once broke out in open insurrection, it was our unquestionable duty to continue our military occupation of it until the conclusion of the war, and to establish over it a military government, necessary for our own security as well as for the protection of the conquered people.

By the joint resolution of Congress of March 1, 1845, "for annexing Texas to the United States," the "adjustment of all questions of boundary which may arise with other governments" was reserved to this Government. When the conquest of New Mexico was consummated by our arms, the question of boundary remained still unadjusted. Until the exchange of the ratifications of the late treaty, New Mexico never became an undisputed portion of the United States, and it would therefore have been premature to deliver over to Texas that portion of it on the east side of the Rio Grande, to which she asserted a claim. However just the right of Texas may have been to it, that right had never been reduced into her possession, and it was contested by Mexico.