I’m pointing out the editorializing implicit in the framing. Apparently groundwater is used for crops all throughout Mexico and the southwest. I definitely wish it weren’t the case and instead a national water grid like how we have national power.
The practical difficulty of transporting large amounts of water long distances is even worse than electricity, so I don't think it'll ever be easy to say "Minnesota has a water surplus this year, let's just adjust the pipes to send it to Nevada".
Awful idea. Why should the wet parts of the country pump their water into deserts where people shouldn't be living/working in the first place? If people want to live in deserts, let them find their own water. No other region should be obliged to supplement their unsustainable desert lifestyle. Let nature take her course and depopulate those deserts in due time. If you want water, move to where the water is.
Everyone benefits from specialization and trade. I don’t see any reason it wouldn’t apply to water too.