Caesar's Legion is an autocratic, ultra-reactionary, utilitarian slaver army founded in 2247 by Edward Sallow (Who later called now simply as Caesar) and Joshua Graham. It is largely inspired and partially based on the ancient Roman Empire, though it isn't the Roman Empire, the Roman Republic or even its military, the Legion. It is a slave army with trappings of foreign-conscripted Roman legionaries during the late empire. All military, no civilian, and with none of the supporting civilian culture. It appears only in Fallout: New Vegas.
The New California Republic (NCR) is a federal presidential republic founded in New California by Aradesh also formerly leader of Shady Sands, comprising five contiguous states and additional territories and holdings in pre-War regions in Nevada, Arizona, Oregon, and parts of Mexico. The Republic dedicates itself to the values of the old world: Democracy, liberty, the rule of law, all in order to make the wasteland a better place. However, its policies resulted in difficulties in recent years. It was founded in 2186, is mentioned in Fallout 3 and Fallout 4, and appears in Fallout 2 & Fallout: New Vegas.
The Enclave is a nation state established after the Great War, formed by members of the pre-War United States government and military industrial complex. It claims authority over the territory of the United States of America, considering itself the legal continuation of the U.S. government and styling itself as such. First appearing in Fallout 2, then later in Fallout 3, its add-on Broken Steel, and is mentioned from its few remaining now retired survivors appears in Fallout: New Vegas with former soldier who now follower for Children of Atom in Fallout 4's add-on Far Harbor.
Shi (Fictional Nation) is a post-apocalyptic nation that is against all post-great war politics. It was founded by survived Chinese spies that established most areas from ruins of San Francisco as City State and uses some elements of the Chinese culture, such as their ancestors' customs, clothing, language, and demeanor. The younger generations, however, seem to rely more on the surviving popular culture interpretations of Chinese culture (such as kung-fu holovideos), rather than actual cultural traditions. It appears in Fallout 2 and is indirectly mentioned in Fallout 4.
Republic of Dave (also formerly called Kingdom of Tom, Kingdom of Larry, the Republic of Stevie-Ray, Billsylvania, and the New Republic of Stevie-Ray) is a small farming settlement in the far northeast corner of the Capital Wasteland (Fallout 3) that is considered by its close-knit inhabitants to be a sovereign nation-state. This nation is actually closer to a Micronation, because since on-off monarchies and republics with an only family control it, and they only had one citizen working as a teacher or merchant (optional) during the game. This "Nation" only appears in Fallout 3.
The Free Economic Zone of New Vegas is a neoliberal autocratic faction led by Pre-Great War survivor Robert House in Fallout: New Vegas. Although it is formally founded if House establishes sovereignty over the Mojave region, in practice, it exists in a practical capacity throughout Mr House's rule in New Vegas.
Allied States of America: A country in the television series Jericho that forms after nuclear weapons are detonated in many of the United States' major cities. Its capital is Cheyenne, Wyoming, and it controls all of the states west of the Mississippi River, with the exception of Texas.
United States of America: A country in the television series Jericho. It is only a fictional country because it only rules over the states east of the Mississippi River. Its capital is Columbus, Ohio.
Map of the world, including the partitioned former United States, as depicted in The Man in the High Castle.
In the world of The Man in the High Castle the United States has been partitioned by the victorious Axis powers after World War II.
Pacific States of America, a puppet state of the Empire of Japan consisting of the west coast of the former United States along with Alaska and Hawaii. Its capital is Sacramento. In the television series it is an occupied province called the Japanese Pacific States.
United States of America, a puppet state of Nazi Germany consisting of the east coast of the former United States and several central states. In the television series it is an occupied province called the Greater Nazi Reich.
Rocky Mountain States, a neutral buffer zone state consisting of the remaining territory of the former United States. Its capital is Canon City. In the television series it is portrayed as a lawless Neutral Zone.
Monroe Republic, was ruled by Sebastian Monroe and his government was a neo-feudal republic dictatorship controlling the former Northeastern United States including Michigan, Wisconsin, most of Virginia, New Jersey, as well as a small part of Canada. The Republic's military, the Monroe Militia, enforces strict laws against citizens owning firearms, which are often punished by death. Also, the Monroe Militia hunts down rebels, who use the Flag of the United States. The capital of the Monroe Republic is Philadelphia with the Independence Hall serving as the capitol building, However in end of Season 1 the Monroe Republic's capital was destroyed by Nuclear Missile, along with Georgia Federation's capital as well thus rendering the two nations scattered until the self-proclaimed 'Original American Government', a paramilitary group named 'The Patriots' take the former nations into their territories, until the Patriots were wiped out by Texas in the comic series.
The Patriots are semi-Paramiltiary/Political group formed from the pre-blackout American government. Their "capital" was Guantánamo Bay before returning to Washington D.C. They first appear in season 1 finale to destroy both the Monroe Republic and Georgia Federation capitals in order to take the territories rather quickly. It was later revealed that the Patriots are actually planning to start Neo-fascisttotalitarian dictatorship and rule America. However, they were later wiped out by Texas in the comic series.
Georgia Federation is a nation-state with a government largely modeled after pre-blackout america located in the former 'Dixie' states. They have a high population and standard of living; even using steam-powered vehicle to fuel public and private transportation. This technology and others also bolsters their immense military, similar to that of the former U.S as well, though more oriented towards border patrol rather than invasive war-making.
Plains Nation, is dominated by Native Americans-like tribes after blackout, whom circulate a specified territory in the midwest. There are also many scattered settlements, though they are largely self-governed.
Texas A nation located in the former US state of Texas, as well as former Mexican Territory, this nation's governance is mostly like that of pre-blackout america, and a high standard of living is enjoyed. While not as advanced as the Georgia Federation, it is stated to be more militarily capable, and the 'Texas Rangers' are served as the main military force. Whilst military and farming technology here is mundane, Texans show great architectural skill, and even have networked newspapers, most notably the 'Austin Star Times'.
California Commonwealth A nation formed from the previous states of California, Oregon and Washington. Not much is known about them, though as evidenced in the show, embassies sent by the Monroe republic tend to disappear, and the Californians appear to have rough relations with the Monroe Republic as well. The head of state is revealed to be woman, named Governor Affleck.
Wasteland An area shown on a map of the Former continental U.S., it is likely that this area is a lawless region, rather than a political entity.
Ecotopia: an ecological utopia appearing in the novels Ecotopia and Ecotopia Emerging by Ernest Callenbach. See also Cascadia, a secessionist idea based in part on Callenbach's Ecotopia.
Opium: from the novel The House of the Scorpion by Nancy Farmer. It is a future nation between Aztlan (formerly Mexico) and the United States. This nation is part of a deal made between the Mexican and American governments and a powerful drug lord named El Patrón, promising that the drugs he makes will be sold in Europe and Asia and will also take care of the illegal immigrant problem if he is allowed a strip of land.
New Korean Federation of Occupied America: A totalitarian puppet state formed as a result of an invasion by the Greater Korean Republic in the video game Homefront. Stretches from the West Coast to an irradiated Mississippi River, as well as Alaska and Hawaii, and borders the actual United States east of the Mississippi.
Panem: A post-apocalyptic country in "The Hunger Games" Trilogy that exists in parts of what used to be the United States, Canada, and Mexico. It consists of a wealthy city known as The Capitol, as well as Districts 1 through 12, which each provide a certain material for the Capitol's residents. The Districts were forced to send challengers to compete in the Hunger Games, long contests with typically only one winner, the last contestant to remain alive.
"Republic" of Boulder City also called "Boulder Free Zone": It's a re-establish democratic city-state formed and founded by "Mother" Abagail in aftermath of World-ending flu; which actually closer of Theocratic-based democracy which formed in Stephen King's The Stand.
Countries in Russian Amerika, the alternate history novel, has 20th-century North America made up of several independent sovereign nations: The point of divergence is that the United States lost the Civil War with the Confederacy; and as a post-war consequence, the Union loses all ground west of the Mississippi River as American-claimed western lands secede from the Union.
The Atlantic Alliance, a nation create out Washington D.C. and most others on the Eastern Seaboard that practice extensive high technology and cyborging to augment it citizens survival. Its capital is very implied be Washington D.C. itself, ruled by Unnamed Atlantican president that have anti-biotechnology policies spark the Second American Civil War in 2161.
Republic of Pacifica, a nation created out California and several other states on the Western Seaboard that practices extensive bioengineering to augment its citizens survival. Its capital is in San Francisco, it is ruled by General Nathan Sheridan, and its secession sparks the Second American Civil War in 2161.
Tropico: a tiny Caribbean Spanish-speaking island-nation of non-specified localisation on which is set the action of the Cold War themed eponymous series of city-building games; it can be either communist or capitalistic, democratic or dictatorial, depending on how the player manages the state of government.
Federation of the Americas: a united South America and Central America that invaded the United States in Call of Duty: Ghosts.
Greater San Miguel (Thirteenth Federated Constitutional Republic of): Featured in the Gomer Pyle, U.S.M.C. episode "Wild Bull of the Pampas" with Larry Storch as its General, and commander of his country's Army, Navy and Air force. This country is located at the foot of a mountain somewhere near Brazil.
Las Acacias (Republica popular de): Country located inside Argentinian territory, as seen in the famous Argentinian series Telenoche.
Miranda / The Mirandan Republic: South American nation from Luis Buñuel's film The Discreet Charm of the Bourgeoisie, from which the character Don Rafael is an ambassador to France. It is referred to by several characters as an unpleasant place with a strict military, oppressive leadership, and high murder rate.
Montenegro: South American nation from Centurions TV series.
Vespugia: South American nation located in Patagonia, site of ancient step pyramids and a history of some Welsh settlement; in books by Madeleine L'Engle. In an alternate timeline it was ruled by a dictator who threatened nuclear warfare.