Abundant cause now undoubtedly exists for a resort to hostilities against the Government still holding possession of the capital. Should they succeed in subduing the constitutional forces, all reasonable hope will then have expired of a peaceful settlement of our difficulties. On the other hand, should the constitutional party prevail and their authority be established over the Republic, there is reason to hope that they will be animated by a less unfriendly spirit and may grant that redress to American citizens which justice requires so far as they may possess the means. But for this expectation I should at once have recommended to Congress to grant the necessary power to the President to take possession of a sufficient portion of the remote and unsettled territory of Mexico, to be held in pledge until our injuries shall be redressed and our just demands be satisfied. We have already exhausted every milder means of obtaining justice. In such a case this remedy of reprisals is recognized by the law of nations, not only as just in itself, but as a means of preventing actual war. But there is another view of our relations with Mexico, arising from the unhappy condition of affairs along our southwestern frontier, which demands immediate action. In that remote region, where there are but few white inhabitants, large bands of hostile and predatory Indians roam promiscuously over the Mexican States of Chihuahua and Sonora and our adjoining Territories. The local governments of these States are perfectly helpless and are kept in a state of constant alarm by the Indians. They have not the power, if they possessed the will, even to restrain lawless Mexicans from passing the border and committing depredations on our remote settlers. A state of anarchy and violence prevails throughout that distant frontier. The laws are a dead letter and life and property wholly insecure. For this reason the settlement of Arizona is arrested, whilst it is of great importance that a chain of inhabitants should extend all along its southern border sufficient for their own protection and that of the United States mail passing to and from California. Well-founded apprehensions are now entertained that the Indians and wandering Mexicans, equally lawless, may break up the important stage and postal communication recently established between our Atlantic and Pacific possessions. This passes very near to the Mexican boundary throughout the whole length of Arizona. I can imagine no possible remedy for these evils and no mode of restoring law and order on that remote and unsettled frontier but for the Government of the United States to assume a temporary protectorate over the northern portions of Chihuahua and Sonora and to establish military posts within the same; and this I earnestly recommend to Congress. This protection may be withdrawn as soon as local governments shall be established in these Mexican States capable of performing their duties to the United States,