=386. The Best Feature of the War.=—The best feature of the Mexican War was not the splendid territorial booty obtained, nor the remarkable leadership displayed by Scott, Taylor, and their subordinates, but the superior morale of the American troops. As these were in the main volunteers, the conduct of the war was all the more a credit to the nation, especially to the Southern and Southwestern states, where the struggle had been popular. These brave volunteers wiped out whatever disgrace attached to the country from the shameful lack of efficiency shown by the troops of 1812. The war was also important for the training it furnished young officers who were destined to play important parts in the Civil War. “Stonewall” Jackson, McClellan, Grant, Lee, and other generals here first showed the stuff that was in them. =387. Results of the War.=—The unequal contest was settled by the treaty of Guadalupe Hidalgo (February 2, 1848). Mexico had to agree to relinquish all her territory north of the Rio Grande and Gila rivers. In compensation for Upper California and New Mexico, the United States allowed her the sum of fifteen million dollars, and undertook to pay some of its own citizens who had claims against Mexico. The territory thus acquired soon threw the country into great political confusion; for certain Northern politicians were determined to prevent, if possible, any extension of slavery in the domain obtained by purchase, even though it lay south of 36° 30′ (§ 329). =388. The Wilmot Proviso.=—As early as 1846, Representative David A. Wilmot of Pennsylvania had proposed an amendment to a bill pending, stipulating that no money should be appropriated to purchase territory unless slavery were prohibited therein; and though this amendment, known as the Wilmot Proviso, had failed, the principle involved in it was made the chief feature of the campaign of 1848. =389. Election of 1848.=—In this struggle five parties were engaged. Certain disaffected Democrats of New York, known as Barn-burners,[175] a party known as the Free Soilers, and the old Liberty Party of the abolitionists,—all being opposed to the extension of slavery,—finally nominated Van Buren. The Democrats nominated Lewis Cass of Michigan, who advocated what was afterward famous as Popular or Squatter Sovereignty,—that is, the right of the people of each territory to choose whether they would have slavery or not. The Whigs nominated General Zachary Taylor of Louisiana, and placed on the ticket with him Millard Fillmore of New York. Their principles were not pronounced; but Taylor was a Southerner and carried a large part of his section with him, while Van Buren’s vote lost New York to the Democrats. Thus Taylor and Fillmore were elected; but the South soon regretted the fact, for the new President showed himself friendly to the anti-slavery men by urging the admission of California as a free state. * * * * *