Benton had come into the Senate at the same time that Missouri was admitted into the Union, with thanks, therefore, to the same measure, the Missouri Compromise bill. This shut out slavery from all territory north of the line of 36° 30', and did not make it obligatory even where it was permissible; and the immediate cause of Benton's downfall was his courage and persistency in defending the terms of this compromise from the attacks of the Southern slavery extensionists and disunionists. The pro-slavery feeling was running ever higher and higher throughout the South; and his stand on this question aroused the most furious anger among a constantly increasing number of his constituents, and made him the target for bitter and savage assaults on the part of his foes, the spirit of hostility against him being carried to such length as finally almost to involve him in an open brawl on the floor of the Senate with one of his colleagues, Foote, who, like his fellow fire-eaters, found that Benton was not a man who could be bullied. Indeed, his iron will and magnificent physique both fitted him admirably for such a contest against odds, and he seems to have entered into it with a positive zest.
The political Abolitionists having put Polk in power, their action bore fruit after its kind, and very soon the question had to be faced, as to what should be done with the immense tracts of territory conquered from Mexico. Benton opposed, as being needless and harmful, the Wilmot Proviso, which forbade the introduction of slavery into any part of the territory so acquired. He argued, and produced in evidence the laws and Constitution of Mexico, that the soil of California and Mexico was already free, and that as slavery would certainly never be, and indeed could never be, introduced into either territory, the agitation of the question could only result in harm. Calhoun and the other extreme slavery leaders welcomed the discussion over this proviso, which led Benton to remark that the Abolitionists and the Nullifiers were necessary to each other,—the two blades of a pair of shears, neither of which could cut until they were joined together.
When Calhoun introduced his famous resolutions declaring that Congress had no power to interfere with slavery in the territories, and therefore no power to prevent the admission of new states except on the condition of their prohibiting slavery within their limits, Benton promptly and strongly opposed them as being firebrands needlessly thrown to inflame the passions of the extremists, and, moreover, as being disunionist in tendency. The following is his own account of what then took place: "Mr. Calhoun said he had expected the support of Mr. Benton 'as the representative of a slave-holding state.' Mr. Benton answered that it was impossible that he could have expected such a thing. 'Then,' said Mr. Calhoun, 'I shall know where to find that gentleman.' To which Mr. Benton said: 'I shall be found in the right place,—on the side of my country and the Union.' This answer, given on that day and on the spot, is one of the incidents of his life which Mr. Benton will wish posterity to remember." We can easily pardon the vanity which wishes and hopes that such an answer, given under such conditions, may be remembered. Indeed, Benton's attitude throughout all this period should never be forgotten; and the words he spoke in answer to Calhoun marked him as the leader among those Southerners who held the nation above any section thereof, even their own, and whose courage and self-sacrifice in the cause of the Union entitled them to more praise than by right belongs to any equal number of Northerners; those Southerners who in the civil war furnished Farragut, Thomas, Bristow, and countless others as loyal as they were brave. The effect of Benton's teachings and the still remaining influence of his intense personality did more than aught else to keep Missouri within the Union, when her sister states went out of it.
Benton always regarded much of the slavery agitation in the South as being political in character, and the result of the schemes of ambitious and unscrupulous leaders. He believed that Calhoun had introduced a set of resolutions that were totally uncalled for, simply for the purpose of carrying a question to the Slave States on which they could be formed into a unit against the Free States; and there is much to be said in support of his view. Certainly the resolutions mark the beginning of the first great slavery agitation throughout the Southern States, which was engineered and guided for their own ends by politicians like Jefferson Davis. These resolutions were absolutely inconsistent with many of Calhoun's previous declarations; and that fact was also sharply commented on by Benton in his speeches and writings. He also criticised with caustic severity Calhoun's statements that he wished to save the Union by forcing the North to take a position so agreeable to the South as to make the latter willing not to separate. He showed that Calhoun's proposed "constitutional" and "peaceable" methods of bringing this about by prohibiting commercial intercourse between the two sections would themselves be flagrant breaches of the Constitution and acts of disunion,—all the more so as it was proposed to discriminate in favor of the Northwest as against the Northeast. Calhoun wished to bring about a convention of the Southern States, in order to secure the necessary unity of action; and one of the main obstacles to the success of the plan was Missouri's refusal to take part in it. Great efforts were made to win her over, and to beat down Benton; the extreme pro-slavery men honoring him with a hatred more intense than that they harbored towards any Northerner. Some of Calhoun's recent biographers have credited him with being really a Union man at heart. It seems absolutely impossible that this could have been the case; and the supposition is certainly not compatible with the belief that he retained his right senses. Benton characterizes his system of slavery agitation, very truthfully, as being one "to force issues upon the North under the pretext of self-defense, and to sectionalize the South, preparatory to disunion, through the instrumentality of sectional conventions, composed wholly of delegates from the slave-holding states."
When the question of the admission of Oregon came up, Calhoun attempted to apply to it a dogma wholly at variance with all his former positions on the subject. This was the theory of the self-extension of the slavery part of the Constitution to the territories; that is, he held that the exclusion of slavery from any part of the new territory was itself a subversion of the Constitution. Such a dogma was so monstrous in character, so illogical, so inconsistent with all his former theories, and so absolutely incompatible with the preservation of the Union, that it renders it impossible to believe that his asseverations of devotion to the latter were uttered honestly or in good faith. Most modern readers will agree with Benton that he deliberately worked to bring about secession.
Meanwhile the Missourian had gained an ally of his own stamp in the Senate. This was Houston, from the new State of Texas, who represented in that state, like Andrew Jackson in Tennessee, and Benton himself in Missouri, the old Nationalist Democracy, which held the preservation of the Union dear above all other things. Houston was a man after Benton's own heart, and was thoroughly Jacksonian in type. He was rough, honest, and fearless, a devoted friend and a vengeful enemy, and he promised that combination of stubborn courage and capacity of devotion to an ideal that renders a man an invaluable ally in a fight against odds for principle.
After much discussion and amendment, the Oregon bill, containing a radical anti-slavery clause, passed both houses and became a law in spite of the violent opposition of some of the Southerners, headed by Calhoun, who announced that the great strife between the North and the South was ended, and that the time had come for the South to show that, though she prized the Union, yet there were matters which she regarded as of greater importance than its preservation. His ire was most fiercely excited by the action of Benton and Houston in supporting the bill, and after his return to South Carolina he denounced them by name as traitors to the South,—"a denunciation," says Benton, "which they took for a distinction; as what he called treason to the South they knew to be allegiance to the Union." When it was proposed to extend by bill the Constitution of the United States into the territories, with a view to carrying slavery into California, Utah, and New Mexico, Benton was again opposed to Calhoun. As a matter of course, too, he was the stoutest opponent of the Southern convention and other similar disunion movements that were beginning to take shape throughout the South, instigated by the two rank secession states of South Carolina and Mississippi.
Most of the momentous questions springing out of the war with Mexico were left by Polk as legacies to his successor, when the former went out of office, after an administration that Benton criticised with extreme sharpness, although he tried to shield the president by casting the blame for his actions upon his cabinet advisers; characterizing the Mexican War as one of "speculation and intrigue," and as the "great blot" of his four years' term of office, and ridiculing the theory that we were acting in self-defense, or that our soil had been invaded. In 1848 the Democrats nominated Cass, a Northern pro-slavery politician of moderate abilities, and the Whigs put up and elected old Zachary Taylor, the rough frontier soldier and Louisiana slave-holder. The political Abolitionists again took a hand in the contest, but this time abandoned their abolition theories, substituting instead thereof the prohibition of slavery in the new territories. They derived much additional importance from their alliance with a disappointed politician in the pivotal State of New York; and in this case, in sharp contrast to the result in 1844, their actions worked good, and not evil. Van Buren, chagrined and angered by the way he was treated by the regular Democrats, organized a revolt against them, and used the banner of the new Free Soil party as one under which to rally his adherents. This movement was of consequence mainly in New York, and there it soon became little more than a mere fight between the two sections of the Democracy. Benton himself visited this all-important state to try to patch up matters, but he fortunately failed. The factions proved very nearly equal in strength; and as a consequence the Whigs carried the state and the election, and once more held the reins of government.
When a Louisiana slave-holder was thus installed in the White House, the extreme Southern men may have thought that they were sure of him as an ally in their fight against freedom. But, if so, they soon found they had reckoned without their host, for the election of Taylor affords a curious, though not solitary, instance in which the American people builded better than they knew in choosing a chief executive. Nothing whatever was known of his political theories, and the Whigs nominated him simply because he was a successful soldier, likely to take the popular fancy. But once elected he turned out to have the very qualities we then most needed in a president,—a stout heart, shrewd common sense, and thorough-going devotion to the Union. Although with widely different training from Benton, and nominally differing from him in politics, he was yet of the same stamp both in character and principles; both were Union Southerners, not in the least afraid of openly asserting their opinions, and, if necessary, of making them good by their acts. In his first and only annual message, Taylor expressed, upon all the important questions of the day, views that were exactly similar to those advanced before or after by Benton himself in the Senate; and he used similar emphasis and plainness of speech. He declared the Union to be the greatest of blessings, which he would maintain in every way against whatever dangers might threaten it; he advised the admission of California, which wished to come in as a free state; he thought that the territories of Utah and New Mexico should be left as they were; and he warned the Texans, who were blustering about certain alleged rights to New Mexican soil, and threatening to take them by force of arms, that this could not be permitted, and that the matter would have to be settled by the judicial authority of the United States. Benton heartily indorsed the message. Naturally, it was bitterly assailed by the disunionists under Calhoun; and even Clay, who entirely lacked Taylor's backbone, was dissatisfied with it as being too extreme in tone, and conflicting with his proposed compromise measures. These same compromise measures brought the Kentucky leader into conflict with Benton also, especially on the point of their interfering with the immediate admission of California into the Union.
This is not the place to discuss Clay's proposed compromise, which was not satisfactory to the extreme Southerners, and still less so to the Unionists and anti-slavery men. It consisted of five different parts, relating to the recovery of fugitive slaves, the suppression of the slave-trade in the District of Columbia, the admission of California as a state, and the territorial condition of Utah and New Mexico. Benton opposed it as mixing up incongruous measures; as being unjust to California, inasmuch as it confounded the question of her admission with the general slavery agitation in the United States; and above all as being a concession or capitulation to the spirit of disunion and secession, and therefore a repetition of the error of 1833. Benton always desired to meet and check any disunion movement at the very outset, and, if he had had his way, would have carried matters with a high hand whenever it came to dealing with threats of such a proceeding; and therein he was perfectly right. In regard to the proposed compromise he believed in dealing with each question as it arose, beginning with the admission of California, and refusing to have any compromise at all with those who threatened secession.