How much can Hitler afford to give the Natcorp without a big effect on his other dastardly plans?? Alot of people in the western states would be first or second generations away from places back east. There should be good amount of folks heading east to fight despite the official neutrality.
It shouldn't take too long to figure out what is going on? Im sure the "neutral" states are sending unofficial operatives of some kind to the rest of the country?
And the Flood of 27 is coming up too! OTL the works keeping the river pointed at New Orleans was done in the early 60s. And the TVA will be a different beast if not an impossibility what with the Commonwealth of Kentucky complicating things.