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I think the article was saying that these batteries are buildable with easy-to-find materials for anyone, USA included. I don't think there's anything in them that can only be found in the United States.

The article is written from a US point of view.

Most other countries also have access to the relevant materials, since most countries are not landlocked.

Sodium battery production may pair nicely with desalination plants.

Most countries in the world don't have their own cobalt or nickel mines, so it's good for all those countries too.