US Presidency
1848

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.