Despite taking place in the American Southwest and Central America, the Mexican-American War (1845-48) had significant ties to the Philadelphia area. As one of the most populous urban centers in the country, the Delaware Valley became a hotbed of activity for one of the most controversial wars in American history. Â Â
General Winfield Scott (depicted on horseback) presented the 1st and 2nd Pennsylvania Volunteer Regiments with their own regimental colors to show his appreciation for their efforts and sacrifice at the Battle of Puebla and the Siege of Mexico City. (Library of Congress)
War between the United States and Mexico followed the admission of Texas as the twenty-eighth state of the United States in December 1845. This exacerbated preexisting tension with the Mexican government, which never recognized Texas independence, American annexation of Texas, nor the proposed border of the new state at the Rio Grande River. After an armed clash between U.S. forces led by General Zachary Taylor (1784-1850) and Mexican troops in the disputed area between the Nueces River and the Rio Grande, Congress declared war on Mexico on May 13, 1846, and authorized President James K. Polk (1795-1849) to call up fifty thousand volunteers to join the existing U.S. Army.
In Philadelphia and elsewhere, the controversy surrounding the coming and course of the Mexican-American War illustrated the widening divide in American society over the issues of territorial conquest and the expansion of slavery. Initially, support for the war was strong in the mid-Atlantic states, and Philadelphia’s historic ties to the American Revolution made it a centerpiece for pro-war patriotism by politicians and cultural figures who viewed Manifest Destiny as the legacy of American independence. The Philadelphia North American, a “penny press” newspaper owned by George R. Graham (1813-1894), reported news from Mexico and supported “Mr. Polk’s War” in editorials. However, Philadelphia’s active abolitionist community opposed the war as a vehicle for expanding slavery into new territory. In June 1846, The National Anti–Slavery Standard, published in Philadelphia, strongly opposed the war based on its abolitionist views against expansion of slavery into the West.
The war was equally controversial in New Jersey and Delaware. In New Jersey, a strong Whig Party presence in state politics made unified action difficult. In October 1847, a convention of New Jersey Whigs condemned the Polk administration’s drive for territorial annexation. Niles’ National Register reported that their resolutions “strongly denounced the present national administration for violations of the liberties of the people and interests of the Union, especially in having made war without consulting the people or their representatives, and that too, for party purposes.” This sentiment was common across New Jersey. When New Jersey Governor Charles C. Stratton (1796-1859) responded to President Polk’s call to organize volunteers for service, the turnout was so meager that only a New Jersey Battalion of Volunteers could be formed, not a regiment. In Delaware, opposition to the war ran so strong that only a dozen residents volunteered to serve.
During the opening stages of mobilization, Philadelphia joined other cities in holding a pro-war rally, but this fervor was not universal. In response to impassioned opposition speeches delivered by Whig politician Henry Clay (1777-1852) in the autumn of 1847, anti-war rallies took place in Philadelphia and Trenton, New Jersey.
The “Killers” in the Ranks
Following the declaration of war, Pennsylvania Governor Francis R. Shunk (1788-1848) called for forming six regiments to serve in the U.S. Army. In contrast to the tepid response in New Jersey and Delaware, patriotic enthusiasm quickly satisfied the quotas, and several full companies had to be turned away. Recruits from the Keystone State were organized into the First  and Second Pennsylvania Volunteer Regiments. Of the ten companies constituting the First  Regiment, six hailed from Philadelphia, including the City Guards of Philadelphia, The Philadelphia Light Guards, and the Cadwalader Grays. The Second Regiment became home to Company F, known as the Philadelphia Rangers.
Explanation:
