New Mexico Territory in the American Civil War

The New Mexico Territory, comprising what are today the U.S. states of New Mexico and Arizona as well as the southern portion of Nevada, played a small but significant role in the trans-Mississippi theater of the American Civil War. Despite its remoteness from the major battlefields of the east and its existence on the still sparsely populated and largely undeveloped American frontier, both Confederate and Union governments claimed ownership over the territory, and several important battles and military operations took place in the region.

In 1861, the Confederacy claimed the southern half of the vast New Mexico Territory as its own Arizona Territory and waged the ambitious New Mexico Campaign in an attempt to control the American Southwest and open up access to Union-held California. Confederate power in the New Mexico Territory was effectively broken when the campaign culminated in the Union victory at the Battle of Glorieta Pass in 1862. However, the territorial government continued to operate out of Texas, and Confederate troops marched under the Arizona flag until the end of the war. Additionally, over 7,000 troops from the New Mexico Territory served the Union.

Prelude to war

The New Mexico Territory was organized as a U.S. territory in 1850, and for many years its precise boundaries and internal administration remained undefined. In 1853, the territory was expanded south of the Gila River in the Gadsden Purchase. Proposals for a division of the territory and the organization of a separate Territory of Arizona were advanced as early as 1856. The first proposals for a separate Arizona Territory were not based on the modern east–west division but rather a north–south division. These proposals arose from concerns about the effectiveness of the territorial government in Santa Fe to administer the newly acquired southern portions of the territory.Colton, p. 198.

The first proposal dates to a conference held in Tucson that convened on August 29, 1856. The conference issued a petition requesting organization of the territory and signed by 256 people to the U.S. Congress, and elected Nathan P. Cooke as the territorial delegate to Congress. In January 1857, a bill for the organization of the territory was introduced into the United States House of Representatives, but the proposal was defeated on the grounds that the population of the proposed territory was yet too small. Later, a similar proposal was defeated in the Senate. The proposal for creation of the territory was controversial in part because of the perception that the New Mexico Territory was under the influence of southern sympathizers who sought to expand slavery into the Southwest.

In February 1858, the New Mexico territorial legislature adopted a resolution in favor of the creation of the Arizona Territory, but with a north–south border along the 109th meridian, with the additional stipulation that all the Indians of New Mexico would be removed to northern Arizona. In April 1860, impatient for Congress to act, a convention of thirty-one delegates met in Tucson and adopted a constitution for a provisional territorial government of the area south of 34 degrees north. The delegates elected Dr. Lewis S. Owings as provisional governor.

However, due to the small number of inhabitants in the proposed territory, the U.S. Congress continued to refuse to recognize any proceedings from any of the conventions being held in the area. Making matters worse, on March 2, 1861, the U.S. government formally revoked a contract with the Butterfield Overland Stagecoach Company which was being used to support delivery of United States mail on the overland route which ran from San Antonio through El Paso, Texas, and on to Mesilla, Tucson and California. The loss of this key communications link with the rest of the United States angered settlers in the Arizona region, just as many states in the Deep South were seceding from the Union.

Politics

Having been only recently annexed from Mexico following the Mexican–American War, the majority of New Mexico's population was apathetic to the ongoing secession crisis in the United States. Aside from their distinct ethnicity and cultural identity, which was primarily Hispanic, the prior experiences of the territory's inhabitants had generated considerable alienation from and even animosity toward Texans. In early 1861, Texans overwhelmingly voted to secede from the Union and the state subsequently joined the Confederacy. As a result, when a side had to be chosen, much of the population of the New Mexico Territory sided with the Union. Many settlers in the region carved out by the Gadsden Purchase willingly joined the Confederate States of America, while much of the rest of the territory remained loyal to the Union. While the people of the southern portion of the territory had closer ties to the South, the more populous northern section had strong ties to Northern trade via the Santa Fe Trail, which connected the region with Kansas and Missouri.

Reflecting Southern sentiment in the southern portion of the territory, a convention was held at Mesilla on March 16, 1861 that adopted an ordinance of secession and called on the citizens of the western portion of the territory (now southern Arizona) to "join us in this movement". Subsequently, a second convention was held in Tucson on March 28, chaired by Mark Aldrich, who had been Tucson's first mayor. The Tucson convention ratified the Mesilla convention, and provisional officers were elected for the newly established Arizona Territory with Dr. Lewis S. Owings as its governor and Granville Henderson Oury as its first delegate to the Confederate States Congress, who immediately began petitioning for admission.

Early in the war, the Confederacy regarded the Arizona Territory as a valuable route by which to potentially access the Pacific Ocean, with the specific intention of capturing California. In July 1861, a small Confederate force of Texans, under the command of Lieutenant Colonel John R. Baylor

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