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The territory of the United States and its overseas possessions has evolved over time, from the colonial era to the present day. It includes formally organized territories, proposed and failed states, unrecognized breakaway states, international and interstate purchases, cessions, and land grants, and historical military departments and administrative districts. The last section lists informal regions from American vernacular geography known by popular nicknames and linked by geographical, cultural, or economic similarities, some of which are still in use today.
Department is an organizational term used by the U.S. Army, mostly prior to World War I, to describe named geographical districts created for control and administration of installations and units. In 1920, most of the named departments were redesignated as numbered Corps Areas. However, the Hawaiian, Panama Canal, and Philippine Departments retained their old names. In 1939, the Puerto Rican Department was created and in May 1941 the Panama Canal and Puerto Rican Departments were combined as the Caribbean Defense Command, although each was still referred to as a department.
The Department of the Pacific or Pacific Department was a major command (Department) of the United States Army from 1853 to 1858. It replaced the Pacific Division, and was itself replaced by the Department of California and the Department of Oregon.
The Department of the Missouri was a command echelon of the United States Army in the 19th century and a sub division of the Military Division of the Missouri that functioned through the Indian Wars.
The Department of the West, later known as the Western Department, was a major command (Department) of the United States Army during the 19th century. It oversaw the military affairs in the country west of the Mississippi River to the borders of California and Oregon.
Thomas West Sherman was a United States Army officer with service during the Mexican–American War and the American Civil War. While some contemporaries mistakenly identified him as the brother of the more famous General William T. Sherman, modern scholarship notes that the two were not closely related.
William Steele was a career military officer and businessman who served as the 16th adjutant general of Texas from 1874 until 1879. He previously served as a senior officer of the Confederate States Army who commanded cavalry in the Trans-Mississippi Theater of the American Civil War.
The District of Oregon was a Union Army command department formed during the American Civil War.
The Department of New Mexico was a department of the United States Army during the mid-19th century. It was created as the 9th Department, a geographical department, in 1848 following the successful conclusion of the Mexican–American War, and renamed Department of New Mexico in 1853. It had to contend with an invading Confederate force during the New Mexico Campaign of the American Civil War from mid-1861 to early 1862, then with Apache tribes during the remainder of the conflict. It was merged into the Department of California after the end of the war as the District of New Mexico.
The District of California was a Union Army command department formed during the American Civil War. The district was part of the Department of the Pacific, the commander of the department also being District commander. The district was created as a separate command on July 1, 1864, after Irvin McDowell took command of the Department of the Pacific, relieving General Wright, who then remained as District of California commander. The District comprised the state of California and the areas of the Rogue River and Umpqua River in Southern Oregon. Its headquarters were in San Francisco, co-located with those of the Department of the Pacific. On March 14, 1865, the District of Oregon was extended to include the entire state of Oregon, removing the Rogue River and Umpqua River areas from the District.
The Department of California was an administrative department of the United States Army. The Department was created in 1858, replacing the original Department of the Pacific, and it was ended by the reorganizations of the Henry L. Stimson Plan implemented in February 1913. As with the preceding organization, headquarters were in San Francisco. Its creation was authorized by General Orders, No. 10, of the War Department, Adjutant-General's Office, September 13, 1858.
Pacific Division of the U. S. Army was one of its superior administrative organizations that existed during the early 19th century and for a short time in the early 20th century.
The Department of the East was a military administrative district established by the U.S. Army several times in its history. The first was from 1853 to 1861, the second Department of the East, from 1863 to 1873, and the last from 1877 to 1913.
Benjamin Lloyd Beall, (1801–1863), U. S. Army officer, who served in the U.S. Cavalry, in the antebellum Indian Wars, Mexican–American War, and American Civil War.
The Military Division of the Missouri was an administrative formation of the United States Army that functioned through the end of the American Civil War and the Indian Wars that continued after its conclusion. It was created by the War Department on February 3, 1865, at the direction of General Ulysses S. Grant to bring all the military departments west of the Mississippi River under a single commander.
During the American Civil War, a department was a geographical command within the Union's military organization, usually reporting directly to the War Department. Many of the Union's departments were named after rivers or other bodies of water, such as the Department of the Potomac and the Department of the Tennessee. The geographical boundaries of such departments changed frequently, as did their names. As the armies became larger Departments began to be subordinated to Military Divisions, and the Departments were often sub divided into Districts and from 1862 Subdistricts. Much information on Civil War departments can be found in Eicher & Eicher, Civil War High Commands.
Eastern Division of the United States Army was one of its superior administrative organizations that existed during the mid-19th century and for a short time in the early 20th century.
William Gates was a long serving career United States Army officer who served on active duty from when he entered West Point as a cadet in 1801 until his final retirement in 1867. He was a veteran of the War of 1812, Seminole Wars, the Mexican War and the American Civil War, to which he was called to duty at the age of 73.
Albemarle Cady was a career United States Army officer who served in the Second Seminole War, Mexican–American War, First Sioux War and the American Civil War. During the Civil War, he was briefly lieutenant colonel of the 7th Infantry Regiment. He then served in administrative positions in the Department of the Pacific, including the District of Oregon. He received brevet appointments for his service in the Mexican–American War and the Civil War. He retired from the Regular Army as a colonel on May 18, 1864. On July 17, 1866, President Andrew Johnson nominated and on July 26, 1866, the United States Senate confirmed the appointment of Cady as a brevet brigadier general in the Regular Army, to rank from March 13, 1865.