I deem it unnecessary, after the full exposition of them contained in my message of the 11th of May, 1846, and in my annual message at the commencement of the session of Congress in December last, to reiterate the serious causes of complaint which we had against Mexico before she commenced hostilities.

It is sufficient on the present occasion to say that the wanton violation of the rights of person and property of our citizens committed by Mexico, her repeated acts of bad faith through a long series of years, and her disregard of solemn treaties stipulating for indemnity to our injured citizens not only constituted ample cause of war on our part, but were of such an aggravated character as would have justified us before the whole world in resorting to this extreme remedy.  With an anxious desire to avoid a rupture between the two countries, we forbore for years to assert our clear rights by force, and continued to seek redress for the wrongs we had suffered by amicable negotiation in the hope that Mexico might yield to pacific counsels and the demands of justice.  In this hope we were disappointed.  Our minister of peace sent to Mexico was insultingly rejected.  The Mexican Government refused even to hear the terms of adjustment which he was authorized to propose, and finally, under wholly unjustifiable pretexts, involved the two countries in war by invading the territory of the State of Texas, striking the first blow, and shedding the blood of our citizens on our own soil.

Though the United States were the aggrieved nation, Mexico commenced the war, and we were compelled in self-defense to repel the invader and to vindicate the national honor and interests by prosecuting it with vigor until we could obtain a just and honorable peace.  On learning that hostilities had been commenced by Mexico I promptly communicated that fact, accompanied with a succinct statement of our other causes of complaint against Mexico, to Congress, and that body, by the act of the 13th of May, 1846, declared that “by the act of the Republic of Mexico a state of war exists between that Government and the United States.”  This act declaring “the war to exist by the act of the Republic of Mexico,” and making provision for its prosecution “to a speedy and successful termination,” was passed with great unanimity by Congress, there being but two negative votes in the Senate and but fourteen in the House of Representatives.

The existence of the war having thus been declared by Congress, it became my duty under the Constitution and the laws to conduct and prosecute it.  This duty has been performed, and though at every stage of its progress I have manifested a willingness to terminate it by a just peace, Mexico has refused to accede to any terms which could be accepted by the United States consistently with the national honor and interest.