As soon as this intelligence reached the United States, Mr. John Slidell was dispatched as envoy extraordinary and minister plenipotentiary on the supposed mission of peace; but when he reached Vera Cruz in November, he found the aspect of affairs changed. The government of Herrera, with which Mr. Black's arrangement had been made, was tottering. General Paredes, a leader popular with the people and the army, availing himself of the general animosity against Texas, and the alleged desire of Herrera's cabinet to make peace with the United States, had determined to overthrow the constitutional government. There is scarcely a doubt that Herrera and his ministers were originally sincere in their desire to settle the international difficulty, and to maintain the spirit of the contract they had made. But the internal danger, with which they were menaced by the army and its daring demagogue, induced them to prevaricate as soon as Mr. Slidell presented his credentials for reception. All their pretexts were, in reality, frivolous, when we consider the serious results which were to flow from their enunciation.
The principal argument against the reception of our minister was, that his commission constituted him a regular envoy, and that, he was not confined to the discussion of the Texan question alone. Such a mission, the authorities alleged, placed the countries at once, diplomatically, upon an equal and ordinary footing of peace, and their objection therefore, if it had any force, at all, was to the fact, that we exhibited through the credentials of our envoy, the strongest evidence that one nation can give to another of perfect amity! We had, in truth, no questions in dispute between us, except boundary and indemnity;—for Texas, as a sovereignty acknowledged by the acts, not only of the United States and of European powers, but in consequence of her own maintenance of perfect nationality and independence, had a right to annex herself to the United States. The consent of Mexico to acknowledge her independence in 1845, under certain conditions, effectually proved this fact beyond dispute.