A long and involved diplomatic history preceded President Polk's simple announcement that "Mexico has passed the boundary of the United States, has invaded our territory and shed American blood upon American soil." Rightly to evaluate these words, the reader should bear in mind that the mission of John Slidell to Mexico had failed; that the hope of a peaceable adjustment of the Texas boundary and of American claims against Mexico had vanished; and that General Taylor had been ordered to the Rio Grande in disregard of Mexican claims to that region. One should also know that, from the beginning of his administration, Polk had hoped to secure from our bankrupt neighbor the cession of California as an indemnity.[223] A motive for forbearance in dealing with the distraught Mexican government was thus wholly absent from the mind of President Polk. Such of these facts as were known at the time, supplied the Whig opposition in Congress with an abundance of ammunition against the administration. Language was used which came dangerously near being unparliamentary. So the President was willing to sacrifice Oregon to prosecute this "illegal, unrighteous and damnable war" for Texas, sneered Delano. "Where did the gentleman from Illinois stand now? Was he still in favor of 61?" This sally brought Douglas to his feet and elicited one of his cleverest extempore speeches. He believed that such words as the gentleman had uttered could come only from one who desired defeat for our arms. "All who, after war is declared, condemn the justice of our cause, are traitors in their hearts. And would to God that they would commit some overt act for which they could be dealt with according to their deserts." Patriots might differ as to the expediency of entering upon war; but duty and honor forbade divided counsels after American blood had been shed on American soil. Had he foreseen the extraordinary turn of the discussion, he assured his auditors, he could have presented "a catalogue of aggressions and insults; of outrages on our national flag--on persons and property of our citizens; of the violation of treaty stipulations, and the murder, robbery, and imprisonment of our countrymen." These were all anterior to the annexation of Texas, and perhaps alone would have justified a declaration of war; but "magnanimity and forbearance toward a weak and imbecile neighbor" prevented hostilities. The recent outrages left the country no choice but war. The invasion of the country was the last of the cumulative causes for war.