But the haughty and defiant spirit of Calhoun was not broken. He prophesied woes. He became sad and dejected, but more and more uncompromising, more and more dictatorial. He would not yield. "If we yield an inch," said he, "we are lost." The slightest concession, in his eyes, would be fatal. When he declared his nullification doctrines it was because he thought that State rights were invaded by hostile tariffs. But after the Mexican War slavery was to him a matter of life and death. He made many excellent and powerful speeches, which tasked the intellect of Webster to refute; but, whatever the subject, it was seen only through his Southern spectacles, and argued from partisan grounds and with partisan zeal. Everything he uttered was with a view of consolidating the South, and preparing it for disunion and secession, as the only way to preserve the beloved institution. In his eyes, slavery and the Union could not co-exist. This he saw plainly, but if either must perish it should be the Union; and this doctrine he so constantly reiterated that he won over to it nearly the entire South. But in consolidating the South, he also consolidated the North. He forced on the issue, believing that even yet the South, united with Northern allies, was the stronger, and that it could establish its independence on a slavery basis. The Union was no union at all, and its Constitution was a worthless parchment. "He proposed a convention of the Southern States which should agree that, until full justice was rendered to the South, all the Southern ports should be closed to the sea-going vessels of the North." He arrogantly would deprive the North even of its constitutional rights in reference to the exclusion of slavery from the Territories. In no way should the North meddle with the slavery question, on penalty of secession; and the sooner this was understood the better. "We are," said he, "relatively stronger than we shall be hereafter, politically and morally." The great fight arose in 1849. The people in the Northwestern territories had been encouraged to form governments, and had already tasted the delights of self-rule. President Polk had recommended the extension of the old Missouri Compromise line of 36° 30' westward to the Pacific, leaving the territory south of that open to slavery. This would divide California, and was opposed by all parties. Calhoun now went so far as to claim the constitutional right to take slaves into any Territory, while Webster argued the power of Congress to rule the Territories until they should become States. So excited was the discussion that a convention of Southern States was held to frame a separate government for the "United States South." The threat of secession was ever their most potent argument. The contest in Congress centred upon the admission of California as a State and the condition of slavery in the Territories of Utah and New Mexico.