To answer your questions, Mr. Peppermints.

[b]Why don't the NCR make an appearance as a main antagonist, as opposed to the BOS?[/b]

The intended plan was always for the YR and the NCR to come into conflict. However, I wanted the YR to have the chance to break out of Yakima county, and take over the whole state, before the New World's largest known super power came knocking.

After the players, or the YR, has successfully driven the Super Mutants into Canada, the Brotherhood into submission, and the Enclave into dust, then the larger world will open up in all directions. To clarify, this RP is not confined to Washington, but it will be to begin with. The reasons for this is that I want to weed out the AWOLers and the dick muppets before I go on to create a larger game-space.

[b]The Brotherhood of Steel have been virtually wiped out, why are they as large as they are in Washington?[/b]

Not quite, the Brotherhood is still going strong, although admittedly its power is in decline. They are crippled, having lost a great deal in their war with the NCR, and the stuff that came before that, but they still operate across the Old United States. Texas, Montana, the East Coast and... the Midwest, if the wiki is to be believed. 

A fictional-fictional Washington Chapter/Expedition, Hell bent on sticking to the old ideals of social exclusion and technology scavenging is not that out of whack, to me anyway. 

[b]The Enclave all died in the Rig. That was the end of them as far as the West Coast is concerned.[/b]

The Enclave in this RP are far removed from the ones we are used to seeing. They are a defeated force, operating as a rally point for Enclave survivors across the region. Genocide and reclamation of the Old United States is no longer their objective, but rather, survival. What the players will encounter will be a technologically and militarily inferior version of what we're used to seeing, and will account for those Enclave members who did not die, and did not hide, and did not get caught in the process of hiding.

Custer's Last Stand, if you will. 

[b]Canada?[/b]

Yes. Canada will become an explorable area, full of something not Enclave, and not Super Mutant... well okay some Super Mutants, but I have a better plan for who lives in the cold wastes of the unknown. 

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Did I do good, or do you still think the BOS needs to go jump off a cliff?