1860s, A Short Autobiography (1860)
Context: Mr. Lincoln's reasons for the opinion expressed by this vote were briefly that the President had sent General Taylor into an inhabited part of the country belonging to Mexico, and not to the United States, and thereby had provoked the first act of hostility, in fact the commencement of the war; that the place, being the country bordering on the east bank of the Rio Grande, was inhabited by native Mexicans born there under the Mexican Government, and had never submitted to, nor been conquered by, Texas or the United States, nor transferred to either by treaty; that although Texas claimed the Rio Grande as her boundary, Mexico had never recognized it, and neither Texas nor the United States had ever enforced it; that there was a broad desert between that and the country over which Texas had actual control; that the country where hostilities commenced, having once belonged to Mexico, must remain so until it was somehow legally transferred, which had never been done.
Mr. Lincoln thought the act of sending an armed force among the Mexicans was unnecessary, inasmuch as Mexico was in no way molesting or menacing the United States or the people thereof; and that it was unconstitutional, because the power of levying war is vested in Congress, and not in the President. He thought the principal motive for the act was to divert public attention from the surrender of "Fifty-four, forty, or fight" to Great Britain, on the Oregon boundary question.
