So...to those who don't think the US
might undergo some planned cleansing if this situation were to arise, let's take a look at this. First, I can tell that some don't know the dynamics of the US very well. As someone who has been through, in, and around every state, as well as many parts of the world, I can tell you that the US is *quite* different in regions.
The "people" around NY city tend to be the most up-tight, snotty, and useless people I have ever seen.
The people in the South can be friendly, but only if you're in the right neighborhood or wearing the same color skin. That goes for anybody there.
The west is pretty laid back...except for smoking and when driving. Get them home to their bong and they are happy and harmless, unless they are a meth head; those should be shot into the ocean with a trebuchet, I volunteer to engineer one of those for that very purpose.
You also have the fine specimens on the East coast, of crack dealers selling to anyone to make it rich off others of his own race.
On the west coast, crystal meth is the pipe candy of the day. Meth labs are so bad, police squad cars carry a can of spray starch to spray onto the wall, to see if the iodine on the wall reacts with the starch. Some meth labs switched to blue wall paint because of this, to avoid plain sight testing.
In the south, you now have an abundance of wetbacks, seemingly bent on taking back Mexico from the gringo invaders one lawn and youth garbage gang-infested block at a time. Oh, wait, this is Fallout and they closed the borders then. Nevermind.
Or maybe you'd like to get rid of the cultists in Utah? The only reason I could see for the US to launch nukes against itself.
In the north, you have a few odd people that are friendly, but that's because they're used to the wilderness life and can deal with Canadians. Well, before the rest of the US decided to annex Canada, and Alaska was a major combat field.
In the east, you have the "white-nosed politician".
Remember, the US was founded upon ethnic cleansing. They didn't quite do such a good job, that they sent more of these people into WWII as cryptologists as an attempt to completely kill them off.
Hmmm...who to remove, to make it easier for the preferable people to spread out?* Depending on where the folks who made the decisions come from and how they look at things, they would choose certain candidates from the Vault system for various reasons.
* - Second, Fallout has Masonic references with the Children, again you can also see why those of the Cathedral in Fallout eventually made it into other cities, to scout them out to see whom should be used and whom should be killed.
They tried for more of the same in Fallout 2, but BIS handled the initial concepts a bit inexpertly.