Southwest Commonwealth Conservation Area

The Southwest Commonwealth was one of the thirteen commonwealths of the pre-War United States. Created in 1969, it was comprised of the former states of Southern California, Nevada and Hawaii.

The commonwealth bordered the Northwest Commonwealth, the Four States Commonwealth, and the country of Mexico.

New California
New California is a region defined by the presence of the New California Republic, which is comprised of the entirety of California as well as areas of northern Nevada, southern Oregon, and Baja California, Mexico.

Former Southern California
Also known as the Core Region, and formerly known as southern California. The city of San Diego was damaged during the war, with its inhabitants eventually leading an exodus to the ruins of Los Angeles, also known as the Boneyard. Located in between is "the Glow," the ruins of a West Tek research facility. Junktown, the Hub, and Shady Sands make up the northern part of the region.

The region would come to be dominated by the NCR, with its core states being located in Southern California. The NCR would control most if not all of southern California, with its borders stretching into Baha to the south, Northern California, and Nevada and Arizona to the east.

Former Hawaii
Not much information is known about the current status of the state. Before the war, a military presence existed in the state, from where destroyer ships were deployed and was a destination for aviators. Vault dwellers will occasionally mention Hawaiian style pizza.

Former Nevada
The former state of Nevada is desolate. Few are able to traverse the rough terrain of the Sierra Nevada Mountains alone. The region is sparsely populated. New Reno is the most significant town of northern Nevada, with smaller settlements such as Vault City, Gecko, and Broken Hills dotting the map.

The Desert Rangers operated out of Nevada, as well as Utah and Arizona. Caesar's Legion would eventually push them out of the Grand Canyon and into Nevada. They would go on to become assimilated into the New California Republic in exchange for protection.

Mojave Wasteland
The Mojave Wasteland is a region comprised of southern Nevada, as well as parts of California and Arizona. A power struggle exists in the area between the NCR, Caesar's Legion, Mr. House, and tribals. Hoover Dam and the New Vegas Strip are the main locations and points of interest.

Major factions

 * The Boomers
 * The Brotherhood of Steel
 * Caesar's Legion
 * The Enclave (formerly)
 * The Followers of the Apocalypse
 * Jackals (formerly)
 * Great Khans
 * New California Republic
 * The Desert Rangers (formerly)
 * Free Economic Zone of New Vegas
 * Unity (formerly)
 * Vault City
 * Vipers (formerly)

Appearances
The Southwest Commonwealth appears in Fallout, Fallout 2, Fallout: New Vegas and its add-ons, as well as the Fallout Bible. It is mentioned in Fallout 3, Fallout 4 and its add-on Far Harbor, Fallout 76, and Fallout Shelter. The pre-War iteration of the Fabulous New Vegas sign appears in the Atomic Command Pip-Boy game. The Southwest Commonwealth was also to appear in Van Buren and Jason Mical's Fallout Pen and Paper d20.