That isn't a lot. New Mexico alone can fit about 100 Rhode Islands. And NM isn't even the largest thinly-populated sunny state in the union.
https://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Wh...
If you dedicated a single (average sized) county per state to solar you'd ~3-5x the land you need for current consumption.
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That isn't a lot. New Mexico alone can fit about 100 Rhode Islands. And NM isn't even the largest thinly-populated sunny state in the union.