Do you think that any single faction that we know of in the West Coast could defeat the NCR and take over all of its turf? Let's go with pre-New Vegas NCR.
The Enclave has been beaten back and the BoS is in hiding, and even if they did ally against NCR, I doubt they could beat them, simply because of the NCR's sheer size.
Is there any possible combination of West Coast factions that could beat NCR together?

Why would they want to beat NCR though?
Gotta have a purpose to fight a super power.

(I got to Go with Gabriel here, There is no reason for any of them to really fight the NCR at this point, so the NCR has all the reason to expand and grow.)

The only Faction that has a chance to take down NCR is the Legion and it will take a very long time to do so. For the Legion to take control of all of NCR (Oregon to Baja) the Legion would have to send every man they have to control/pacify it. NCR would also have troubles taking control of all of the Legions lands.

Depending on the ending to Tactics, maybe the MWBOS/Caculator combine.

The BOS could. Yes, I know this is a contraversial choice, but I believe that a single nuke smuggled into NCR City would be enough to cause the NCR to implode, and I think the BOS could build one.

The way to take down the NCR isn't in a front on fight, but to hit that massive weak spot.

MWBoS Calculator army could yes, but we have to learn that theres "hard times."

Even if Shady Sands was nuked I don't think that could stop NCR. If a nuke took out the capital of your country and only the capital would that cause your nation to fall apart? Might make your naton bloodthirsty for revenge and make them fight harder against those that did it. (this question is not just for agent_c, its a question for all.)

I want to answer a partial agreement, but I really cant go into further detail without bringing RW politics with me.

If the NCR capital was to fall though, I think we'd simply see too much infighting for the NCR to be a force... the northern economic powerhouse (Reno) fighting with the southern economic powerhouse (Den) for the right to claim itself as head of the republic, VC using the chaos to go its own way.

Not being able to use RW examples can make things more difficult. Still the location you mentioned are questional as "economic powerhouses." The States of NCR are in the south, FO1 locations. Fallout 2 locations such as the Den and Reno are territories of NCR. There is also San Fransisco, I know it is a Fallout 2 location but it seems to be an even bigger power base then the Den and Reno combined.

NCR could also have a back up plan if Shady Sands gets nuked. They have the use of pre-war vaults to build bases in. There is Vault 15, Vault 8 and Vault 13. They could have pre-war bunkers as well. Redding is also an "economic powerhouse" and it has mines to build bases in.

The Brotherhood of steel has the best chance of beating them. However i think their destruction will come from within if you get what I'm saying..

People can think up reasons. Caesar wants to destroy them because he doesn't like their system. Let's just say that the NCR did something to piss the other faction off.

This topic is without reason, purely can anything beat the NCR. Only the Legion, and as Styles said, would be able too and would have to essentially move the entire civilisation to fight them. The NCR and Legion are two super-powers locked in an eternal stalemate, even the NCR ending in NV only confirms that the Legate's Camp was destroyed, the Legion ending shows him defeating all of the NCR forces in the Mojave.

MWBoS could do it with most of the endings to Tactics.

But what factions can we bring to the fray? The OP said only west coast, but as far as we know they are the only west coast faction. The (Barnaky's) MWBOS certainly could bring them down, and in time they probably would, they're too different not to. Legion can also bring them down. Even the MLA may be able to defeat them as well, provided we only take the NCR vs MLA and disregard the MWBOS in this picture. I think MLA vs NCR would be evenly matched, while in the MWBOS/Legion vs NCR case the NCR is the underdog.

I'll define that then. Any faction from Colorado/Arizona westward. So MWBoS is out.

So that would also mean Caesars Legion is out and btw MWBoS are from Illinois just outside Chicago but they expanded to Colorado, during the time of Tactics. To be technical they came from California like all BoS.

So only Factions from California that could win against the NCR? Brotherhood maybe depending what shape they are in. NCR in New Vegas did not talk much about them or any war going on back home.

The Shi, could. Not sure if they if they are independant or allied or annexed by NCR but they have their own Emperor. They have a large population, very advanced weapons, they have the ability to get T-51b power armour and make it hardened PA. They have great researchers and science people, they can do genetic engineering, so who knows that they can do with their science skills. Martial arts is a way of life for them, better then any NCR Ranger. I can see the Shi sending out teams to gather research and tech from all over the wastes. Anything to do with pre-war genetic engineering and biological research. Still they are a peaceful people :shifty:

Arizona westward includes the Legion. Even if I'm wrong and it doesn't, let's just let them into the equation.

The brotherhood of steel could, using guerilla warfare & scare tactics. The BoS could possibly make nukes, and if they could make more than two, i could see them winning. You blow up Shady Sands, San Fransisco(If part of the NCR) and possibly Vault City. Even more desertions than there are at Vegas, it's not that they're losing a war this time, their losing their families and institutions that they fought for.

The BOS has already lost.

The only one I could see beating them is the Legion, but I think it'll be a stalemate between the two.

Agree about the stalemate between the Legion and NCR. As for the BoS losing to NCR, well that was only one chapter vs some NCR in the Mojave. The BoS only acted the way they did because their leader went nuts and ran off. We learned nothing about the War back in California.

Its just that chapter? I thought the organisation as a whole went to war against the NCR?

Nuking VC isnt required IMO. They are quite independent minded as it is and I'm sure would gladly use any opportunity to reclaim it.

From my understanding the whole organisation did but we don't learn anything about the Brotherhood back in California. Mojave Chapter don't talk about them and NCR does not mention any war happening back west. Could this mean NCR won or does it mean they made peace? we don't know. One of the endings I think mentions the fighting continues back west. Still NCR does not mention it, so maybe the fighting is not that bad.

This. NCR will be it's own destruction. Might make a good civil war story line for future games.

Any faction in it's current state (excluding the MWBoS because we do not know their current state) would lose to the NCR. But give a BoS chapter that gives up on technology and wish to fight for their families and freedom time, space, and tribals they could eventually become a superpower just as strong as the NCR... I doubt the Legion could because they use even more primative weapons the NCR troops.

The Legion.
People constantly overrate gunpowder weapons. And given what I seen of weapon quality and discipline in the NCR?
The Legion have a fair chance. Now if you supplement those service rifles with some grenades and submachine guns, and add some harsh training then things change drastictly. As long as you have ammo, and good intel.