but the thing is that California need to be get from Mexico before, unless America push a war (wish I'm not sure they would push one for california although it might interest them having a west coast, but it might undermine their ability to have Oregon, since it might be more resolve to stop american expasionism). But I was more refering to the possibility of a super-state made out of the Lousianna Purchase although it would be harder to develop.
But considering it would have been several decades earlier Texas, probably would be smaller, less develop and off course a whole lot of place would have different names.