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¿Question #226691?
pricero1: Why is Oklahoma the only US state to manufacture iodine?

TomTi89: Literally just so that MABBY can use the information for a quiz night.
MABBY: After rearranging it a bit, I'm stealing this question for quiz night.
BOBBYCAN: I don't know. I guess our big salt lake isn't briney enough.
PolarDad: Not only that, we are third in the world...just behind Chile and Japan. To your question, it is due to the ocean that used to be here. Google "Salt Plains National Wildlife Refuge"