Add everywhere in Nevada except Clark County and you got a deal.
Clark County, aka "East East LA".
On a historical note, the notion of splitting up CA has come up numerous times since the state's inception, with splits east-west as is shown here, north-south and every combination in between. One thing to keep in mind--the large population centers are liberal, but the money and hence tax revenue are centered there also. Maintaining infrastructure on large swaths of land (think roads) with few taxpayers tends to be burdensome.