The Mexican War saw the sectional divide widen further as abolitionists and their allies in the North asserted that this was “simply a Southern plot to bring more slave States into the Union.” As New England sided with the enemy during the War of 1812 by selling them supplies and threatened to secede and form a separate republic, they would side with the enemy in 1846. The contingent of Americans fighting with the Mexicans noted below were the “San Patricios,” Irish Catholic immigrants in the US Army who refused to fight against Mexican Catholics. Those captured were executed for treason. Ohio Senator “Black Tom” Corwin denounced the war in Congress and was summarily hung in effigy near Buena Vista by Ohio troops. They first dressed his likeness in a Mexican uniform.
Bernhard Thuersam, www.Circa1865.com
Santa Anna Popular Up North
“Daniel Webster flung his oratory into caustic criticism of the war and he was abetted by fanatics like [Charles] Sumner. Soon, drinking of this heady fire water, Northern newspapers were fulminating against [President James] Polk and the continuance of the war. This was one of the few wars waged by the United States in which the enemy was popular.
Black Tom Corwin said that American soldiers in Mexico should be welcomed by “hospitable graves,” and a whole nightmare school of literature sprang up. Some papers called for European intervention. One said editorially: “If there is in the United States a heart worthy of American liberty, its impulse is to join the Mexicans.” Another said: “It would be a sad and woeful joy, but a joy nevertheless, to hear that the hordes of Scott and Taylor were every man of them swept into the next world.”
Santa Anna, the rascally Mexican commander, became a hero in Boston and New York, and there was even a contingent of Americans who fought with the Mexican army.”
(Merchants of Death, A Study of the International Armament Industry, H.C. Engelbrecht & F.C. Hanighen, Dodd, Mead & Company, 1934, excerpt, pp. 28-29)