Line up every faction in Fallout that is big enough to draw on a map, and something awkward shows up: almost none of them grew out of the wasteland. The Brotherhood of Steel is a U.S. Army detachment. The Enclave is the federal government’s own backup copy. The Institute is a university basement. Mr. House is not a successor to the pre-War world at all — he is a man from it, still breathing.
Wasteland-native groups do exist. The Minutemen, the Powder Gangers, the Kings, the Great Khans. Every one of them is small. The largest never held so much as a single state. Two hundred years after the bombs, every power with a border on it traces back to something the old world left behind.
This is the overview piece for Fallout’s factions. It does not sort them by game or by strength. It sorts them by a question that explains more than either: what, exactly, did each one inherit? Hardware beats institutions, institutions beat a borrowed name. There are two exceptions to that rule, and they happen to be the two factions players argue about most.
The robots guarding the Strip are pre-War RobCo products, and the man giving them orders is pre-War RobCo’s founder. New Vegas is this rule on open display
A quick inventory
Before any argument, the receipts. Each of these origins is stated outright in the games.
The Brotherhood of Steel comes from a U.S. Army detachment stationed at the Mariposa Military Base, founded by Captain Roger Maxson, serial number 072389. The Enclave comes from the continuity of government program — a real apparatus the United States still operates today, set out in Federal Continuity Directive 1, which requires executive branch organisations to designate orders of succession, alternate facilities and minimum essential functions in advance. The games import it whole, with assets such as the presidential oil rig and the congressional bunker secured ahead of time. The Institute comes from the Commonwealth Institute of Technology, whose people went underground on the day of the Great War and never came back up. Mr. House is Robert House, founder of RobCo Industries, born June 25, 2020, kept alive to 2281 by a life-support chamber he built himself.
The New California Republic comes from vault dwellers who walked out and founded a settlement called Shady Sands. The Followers of the Apocalypse also come from vault dwellers, joined by people living near the Glow. The Commonwealth Minutemen are a local volunteer militia that made its name in 2180. Caesar’s Legion was founded by Edward Sallow, who came out of the Followers, where his job was copying and translating texts.
Read that list twice and the fault line is not pre-War versus post-War. It is what each group carried out of the old world.
The same roster on a different axis. The power ranking falls out almost on its own — and one faction put itself in the bottom row on purpose
The Brotherhood of Steel: an Army unit that never got a reply
The Brotherhood did not begin with an idea. It began with a mutiny.
In 2076 the Army sent a team into the West-Tek research facility to watch what the scientists there were doing. On January 7, 2077, the research and its security detail moved to the Mariposa Military Base. That October, Captain Maxson and his men found out what the work actually was: Forced Evolutionary Virus trials run on military prisoners who had not agreed to anything.
What happened next is in Maxson’s own log. On October 20 he finally answered the outside world by radio and declared the entire detachment seceded from the union. He closed the entry by writing that they remember Jefferson Davis, and asking what history would say about him.
Three days later the bombs fell. No history came to judge him, because the country he deserted stopped existing that week.
What the Brotherhood took with it was physical: power armor, energy weapons, the Mariposa technical archive, and a government bunker at Lost Hills. For the next two centuries, whichever chapter you meet — Lyons in the Capital Wasteland, McNamara in the Mojave, Arthur Maxson in the Commonwealth, Rahmani in Appalachia — the hardest asset in the room came out of that one relocation in October 2077. So did every schism the order ever had, which is the subject of its own article.
The Enclave is not imitating the government. It is the government’s backup.
Players often file the Enclave under lunatics cosplaying as America. That gets the causation backwards.
In the games’ own words, the Enclave was a secret contingent of the United States government formed as part of the continuity of government system. During the Resource Wars its members drew up contingency plans for nuclear war and secured installations including the presidential oil rig and the congressional bunker. In March 2077 the President withdrew to the rig — and it made the papers. The Boston Bugle reported that the move gave credence to long-running rumors of a secret, militarized shadow government.
So the Enclave is not somebody picking up an abandoned flag after the war. It is the pre-War state continuing to run its own playbook. Its presidency has continuity. Its facilities were stocked ahead of time. Its leverage over Vault-Tec was exercised as an investor. It is deranged, but it is not a forgery.
That explains where its firepower comes from. Vertibirds, advanced power armor, the complete FEV research record — none of that is buildable in the wasteland. It was handed over intact by the pre-War defense apparatus. The most extreme product of that inheritance is a person — Frank Horrigan, whose Enclave power armor doubles as the life support keeping him alive. It also explains why the Enclave keeps losing. An organization executing a plan will keep executing it, and nowhere in the plan is a line acknowledging that the people who have lived out there for two centuries are Americans too. How that never-revoked authorization emptied out link by link is taken apart in the Enclave piece — the one where its own colonel keeps the shutdown code for the President in a footlocker.
The Institute and Mr. House: two graduates of the same school
These two belong together because their origins overlap in a way that is easy to miss.
The Institute sits on what was the Commonwealth Institute of Technology. The people present on the day of the Great War took shelter underground and simply kept working. The campus above them spent two centuries as rubble; the labs below never closed for a day. Early on they even tried to cooperate with the surface, working toward a stable Commonwealth government — an effort that ended when their synth representative killed everyone else at the meeting. Afterward they built the Molecular Relay, a teleporter, and sealed themselves off entirely.
Robert House also attended C.I.T. He founded RobCo Industries on his twenty-second birthday. At 5:17 in the morning on April 14, 2065, he concluded that atomic war would arrive within fifteen years, and started preparing Las Vegas for it: structural defenses for the city, a missile interception grid, Securitrons, and a Platinum Chip holding the software upgrades all of it would need. He also built himself a chamber to extend his life, wiring his brain into the subsystems of the Lucky 38.
Same school, two students. Two centuries later one of them is underground manufacturing synthetic people and the other is floating in a tank running a single street. Neither of them rebuilt anything. They preserved the version of themselves that existed in 2077. The Institute’s synths are pre-War bioengineering carried forward without interruption; House’s Securitron army is pre-War RobCo inventory. Which is why neither faction can realistically be beaten by force on its own map. When the player wins, the player wins by walking in through a door.
Exception one: the NCR inherited paperwork, not equipment
The New California Republic breaks the rule, and it breaks it cleanly. Its full origin, the chalkboard timeline and what else happened in that same year get an article of their own.
Its starting position could not be lower: some people out of a vault, and a small settlement named Shady Sands. A chalkboard in Vault 4 keeps the timeline — Shady Sands founded in 2142, the NCR created in 2198, Shady Sands made the capital that same year, the largest economic and political power in California by 2241, and the Fall of Shady Sands in 2277.
Aradesh and his daughter Tandi first proposed the Republic; three years later five states voted themselves into it: Shady, Los Angeles, Maxson, the Hub and Dayglow, some 700,000 people. Aradesh served as first president. Tandi was chosen by the council and held the office for fifty-two years.
Notice what the NCR does not have. No power armor production. No vertibirds. No teleporter. What it has instead is voting, a council, presidential terms, written law, a standing army, a currency and taxes. Its written law varies by locality rather than running uniform across the territories — in the town that serves as the Republic’s capital, slavery, gambling and drugs are all banned. It is the only thing in the series that genuinely resembles a country.
That is its strength and its exposure at the same time. Killing a hardware inheritor takes a battle. Killing an institutional one only takes a procedural failure. The Fall of Shady Sands was not a lost siege; the NCR’s grip on southern California and the Mojave loosened along with it. By 2296, Captain Rodriguez and her troops had spent ten years cut off from reinforcement in the mountains near Primm, surviving on their own.
Exception two: the Legion is the only faction that threw the hardware away
The second exception runs the other direction.
Edward Sallow came out of the Followers of the Apocalypse, where his work was recording and translation. With Joshua Graham he took a book about Rome and reshaped a group of tribals into a legion. He declared himself Caesar in 2247 and had them raiding at a larger scale within the week.
The Legion inherited exactly one thing: a name, and it got that out of a book. It holds no pre-War installation, and it does not want one. That is a decision, not a limitation. When the Courier suggests using Mr. House’s technology against Hoover Dam, Caesar’s answer is explicit: the weapons he wields are made of blood, flesh, sinew and bone, mortal stuff, fragile even — while House’s machines offer the possibility of victory without sacrifice.
A bloodless victory is worthless to Caesar, because what he wants is not to win but to be obeyed by men willing to die. That logic makes the Legion terrifying while it expands and stakes its entire stability on one man. Season two of the show delivers the payoff: after Caesar’s death the Legion splinters, with several men crowning themselves Caesar and fighting each other. His last act had been to write his intended successor’s name on a sheet of paper and put it in his pocket.
In the season finale the Lacerta Legate drags the mummified body back to Caesar’s tent and finally unfolds the note. It does not contain a name. It contains three sentences: I am Caesar. I am the Legion. It ends with me.
A legionary walks in and asks what it says. The Legate answers “Caesar is dead. Long live Caesar,” stabs him to death, eats the note to destroy it, takes the laurels off the corpse and puts them on. Outside, the survivors start hailing him as the new Caesar, and he announces they will take New Vegas and build a palace worthy of the Legion there — Caesar’s Palace.
Which means the Legion now marching is founded on a suppressed document. That stretch is show material, continuous with but later than the games; this article reports it as given and does not try to reconcile it with any 2281 ending.
The ones that only borrowed a name
Most of what is left sits in the bottom tier, holding symbols.
The Commonwealth Minutemen borrowed the Revolution. The name comes from the militia that could assemble at a minute’s notice; headquarters is Fort Independence in South Boston, which they call the Castle; a statue by the Old North Bridge marks where the first shots of the Revolutionary War were fired. They rose to prominence in 2180 by leading the defense of Diamond City against a mass super mutant attack. By the 2230s they were convening a Commonwealth provisional government with the regional settlements — an attempt the Institute ended by sending a synth to the meeting and having it kill everyone in the room. Their headquarters fell in 2240, and by 2287 they had been all but wiped out.
Followed end to end, the Minutemen’s problem is legible. What they borrowed from the Revolution is a set of symbols about citizens organizing themselves, and symbols do not solve any specific difficulty. They do not stop mutants, and they do not stop an opponent who can manufacture people.
The Followers of the Apocalypse are a partial case, sitting on the edge of the institutional tier. Their founder Nicole had a personal motive: she lost her parents on the journey north, and said it was time the killing stopped, that her aim was to make the land the way it used to be before the war. They set up in the Boneyard Library, taught farmers crop rotation, ran free classes, studied pre-War survival technique. What they inherited was books. By 2280 they had outposts in every major city in the NCR — enormous reach, and never a border.
Below that are the purely native products: the Great Khans, the Powder Gangers, the Kings, the assorted raider crews. Their ceiling sits very consistently at one town or one stretch of road. That is not an accident. In Fallout’s own terms, building the industrial capacity to challenge a real faction from nothing takes far longer than two centuries — so everyone at the table started with a piece of the old world in hand.
What the New Vegas choice is actually asking
With the tiers laid out, the famous three-way standoff stops being a question about which faction is nicer.
Mr. House represents preservation. He wants the world of 2077 continued without alteration, administered by him, because he personally is the surviving piece of it. The NCR represents reconstruction. It is not restoring pre-War technology; it is restoring procedure — ballots, statutes, taxation — and accepting the bloat and graft that come attached. Caesar’s Legion represents severance. It holds that the old world’s arrangements are the reason the old world failed, and replaces them with a structure forged from scratch that leaves the individual no room at all.
Three positions on the old world, not three management styles. That is why this choice carries more weight than the faction picks elsewhere in the series. It is not asking who you want to win. It is asking what you think people are supposed to do with a dead civilization.
Quick reference: who inherited what
Brotherhood of Steel — hardware. Originates in the Army detachment at Mariposa, which withdrew to Lost Hills in October 2077 with power armor and technical archives. Chapters do not answer to one another, and interpretation of doctrine has driven every internal war it has had.
The Enclave — hardware and standing. A product of the continuity of government program; the oil rig, Raven Rock and the Whitespring bunker were all pre-positioned. It influenced Vault-Tec as an investor. Full piece here.
The Institute — hardware. Survivors under C.I.T., built around the Molecular Relay and synth production. Relations with the surface ended after one failed negotiation.
Mr. House — the man himself. RobCo’s founder, preparing for the war since 2065, alive via life support and a cerebral interface, holding a Securitron army and the Platinum Chip.
New California Republic — institutions. Grown from Shady Sands, chartered by a five-state vote in 2198, with elections, a council, written law and a standing army. Badly contracted after the Fall of Shady Sands in 2277, but not gone — as late as 2296 it still fields organised units in the Mojave (full breakdown).
Followers of the Apocalypse — knowledge. Founded by vault dwellers and people from near the Glow, based in the Boneyard Library, working in education, agriculture and medicine, claiming no territory.
Commonwealth Minutemen — symbols. A local militia, prominent from 2180, headquartered at Fort Independence, whose bid for a provisional government the Institute destroyed.
Caesar’s Legion — a name, plus an active refusal of hardware. Built by Edward Sallow and Joshua Graham, imperial from 2247, expanding by absorbing tribes, entirely dependent on Caesar himself.
A few things get counted as factions but are not. Super mutants are a product of the Forced Evolutionary Virus rather than an organization, and the super mutants of different games have no command relationship. Raiders is a label for a whole category of armed crews, not one power. Vault dwellers are likewise not a faction — they are the output of 122 separate vaults, and what those 122 were each doing is covered in our full breakdown of the vault program. To follow the rise and fall of these powers in order, see the complete Fallout timeline.
Three things people get wrong
“The Enclave is post-War impostors pretending to be the U.S. government.” No. The Enclave is a secret branch of the continuity of government system that existed and operated before the war. The President moved to the oil rig in March 2077 and the press covered it. Its claim to authority is legally continuous, which is precisely what makes it hard to dismiss.
“The Legion avoids high technology because it is backward.” Half right. The Legion has no pre-War supply line, but its refusal of technology is stated as a choice, not a shortfall. Caesar’s own reasoning is that machines deliver victory without sacrifice, and sacrifice is the fuel his obedience runs on.
“The NCR became the biggest power through military strength.” Half right. Its standing army is the largest in the series, but the order of events runs institutions first, army second: a town in 2142, a five-state vote in 2198, expansion after that. What lets it dominate is population, currency and law — its equipment lagged behind the Brotherhood and the Enclave for most of its history.
Common questions
How many factions are there in Fallout? There is no official count, because faction has no fixed definition here. Counting only powers that hold territory with a structure and a doctrine, the cross-game total is around ten. Counting tribes, gangs and one-off groups puts it in the hundreds. This article handles the former.
Which faction is the strongest? By usable pre-War technology, the Enclave. By population and organizational capacity, the NCR. By the quality of an individual soldier, the Brotherhood. Those three metrics do not converge, so any ranking has to say which one it is using before it means anything.
Are the Brotherhood chapters one organization? Nominally yes, functionally no. Chapters go out of contact for decades, disagree sharply on doctrine, and have fought each other. The full answer is in the Brotherhood article, which starts from the founder’s diary.
Do vault dwellers count as a faction? No. They are the output of 122 separate experiments with no shared program, and dwellers of different vaults are sometimes enemies. To see where the differences come from, start with what all 122 vaults were doing and then a specific case such as Vault 111.
Can you join multiple factions in Fallout 4? You can join all four and run their questlines in parallel; exclusivity only triggers at a few turning points. The Institute is the one faction that cannot coexist with anyone: each of the other three endings destroys it, and its own ending destroys both the Brotherhood and the Railroad. The Minutemen are never exclusive with anybody and can stay allied in all four endings. The ceiling is Minutemen, Brotherhood and Railroad all left standing at once — which requires avoiding the three turning-point quests (Tactical Thinking for the Brotherhood, Underground Undercover for the Railroad, and starting Mass Fusion for the Institute), getting yourself banished from the Institute instead, triggering Evacuation Protocol BD-2, and then destroying the Institute with the Minutemen. One caveat: on that route the Brotherhood is supposed to promote you to sentinel, and a bug stops the quest from firing.
Where this article’s evidence sits
In-game text: Captain Maxson’s diary (the Mariposa terminal in Fallout, the Citadel archive terminal in Fallout 3), Caesar’s dialogue in Fallout: New Vegas, the Vault 4 chalkboard, the Boston Bugle report, the Institute and Minutemen material in Fallout 4, the Legion’s fracture in season two of the show (S2E3 and S2E8). This layer carries essentially all of the factual claims above.
Official published material: the Fallout: New Vegas Official Game Guide, used for the year Sallow declared himself Caesar.
Early design notes (the Fallout Bible, 2002): not used in this article.
Reader inference: the central claim — that a faction’s reach tracks the type of thing it inherited — is our synthesis, not an official statement. It rests on the sources above, but no game says it. The explanation offered in the borrowed-name section for why wasteland-native groups hit a ceiling is inference as well. The same material would support other arrangements.
Sources
In-game text and data. Fallout, Mariposa Military Base level 4 vat control computer (full text of Captain Maxson’s diary); Fallout 3, the Maxson archive terminal at the Citadel; Fallout: New Vegas, Caesar dialogue and the Vault 4 NCR chronology chalkboard; Fallout 4, C.I.T. and Institute material and Minutemen history; Fallout 76, Appalachian Brotherhood records; Boston Bugle pre-War reporting; entries for the Enclave and Caesar’s Legion, used for indexing and cross-checking.
How this text was retrieved. The in-game material above was read through the verbatim transcriptions and file dumps collected at fallout.wiki, not from files unpacked here. That site is the retrieval path, not the source: the work, location and file name behind every quotation is given inline, and anyone who owns the game can check them directly. Where this article cites something written by that site’s editors rather than the game itself, the body says so.
Official publications. Fallout: New Vegas Official Game Guide, Collector’s Edition p. 461. A print publication with no official online edition; the page number is given inline.
Television. Season two, episode 3 The Profligate and episode 8 The Strip (the Legion civil war and Caesar’s note).
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