That was just a theory and it has been proven to be wrong. The Fallout bible is wrong. It has happened before. Fallout bible is not canon.
Here is the thread that proves that the "Enclave around the world" mention in th bible is wrong. There is alot of reading http://www.gamesas.com/index.php?/topic/1167059-the-enclave-in-americas-future/
Sigh. My internet is haywire so I will read this thread in entirity when it gets better.
However, I reaad a bit and basically because borders closed, you saying it impossible for Enclave to spread out globally.
I disagree. If they went say, north pole, south pole, mexico, what was formerly Canada, south america, that is global.
Borders closed doesn't mean jack. They prolly could have gone western europe even.
Was there not a Nazi party? Did this group not lose WW 2? However, many Nazis eluded capture and spread out globally after defeat...and they were being HUNTED.
Nobody is hunting Enclave. They rich and powerful. They can go anywhere.
But let's pretend only places they go are more accessible, so north, south poles, former Canada, Mexico and South America. That would still be considered "global"
Not to mention they would be spread out across the USA. If I'm not mistaken, you questioned how an army of BoS made it to DC in two years. Well, how is small groups of Enclave who are not an army, supposed to make it to oil rig?
Communication gonna be awful. One group of Enclave will not know if another group is alive, dead, busted comm, nothing. They are just going to do one thing: SURVIVE.
I think big thing is they are not being hunted down and exterminated. Do I think they have huge army? No, but it makes perfect sense they have other bases and installations that are manned by people yet to be discovered and how powerful they are is yet to be determined.