The Whig, a very respectable party, having in its ranks the majority of the men of wealth and education, fell a victim to the doctrine of availability when it nominated Harrison on account of his military reputation. He lived only one month after his inauguration, and Tyler, the Vice President, who succeeded him, reverted to his old political principles, which were Democratic, and broke with the Whigs. By an adroit and steady use of the executive power he effected the annexation of Texas, but the master spirit in this enterprise was Calhoun, his Secretary of State. Polk, his Democratic successor, coveted California and New Mexico, tried to purchase them, and not being able to do this, determined on war. In fact, he had decided to send in a war message to Congress before the news came that the Mexicans, goaded to it by the action of General Taylor, under direct orders of the President, had attacked an American force and killed sixteen of our dragoons. This gave a different complexion to his message, and enabled him to get a strong backing from Congress for his war policy. The actions of Tyler and of Polk illustrate the power inherent in the executive office. It might seem that the exercise of this authority, securing for us at small material cost the magnificent domains of Texas, California, and New Mexico, would have given these Presidents a fame somewhat like that which Jefferson won by the purchase of Louisiana. But such has not been the case. The main reason is that the extension of slavery was involved in both enterprises, and the histories of these times, which have molded historical sentiment, have been written from the antislavery point of view. It seems hardly probable that this sentiment will be changed in any time that we can forecast, but there is an undoubted tendency in the younger historical students to look upon the expansion of the country as the important consideration, and the slavery question as incidental. Professor von Holst thought this changing historical sentiment entirely natural, but he felt sure that in the end men would come round to the antislavery view, of which he was so powerful an advocate.