US Presidency
1848

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.