Europe was forgeted by the resource wars, nothing left.
China was loving VAPORIZED in the great war, as we fired our entire nuclear arsenal at them, and nobody else, while china fired theirs at both Europe and us.
If the resource wars didn't take out the UK, either China or fallout from Europe would've, and Japan is in a similar boat due to being near China.
EDIT: I think Japan had been taken over by China, so we'd of forgeted them too.
Also China evidently didn't have as much nuclear countermeasures as we did, so our offensive was met with barely any resistance, while we had disabled most of theirs.
tl;dr asia is forgeted and europe would've been horrendously irradiated to the point that necropolis looks clean.
also also, stop loving saying LA, Fallout 1 has gone over it. LA was pretty much destroyed.