Hi
Making a near-future empire builder similar to total war. The player fights for control of cities on the world map. Technology is semi-scifi (you still have factories, tanks, infantry, rockets and nukes, no super-laser robots or star destroyers. But maybe hoovercrafts and powersuits!)
I want a rare resource to be one of the "advanced currency" next to funds. My best idea so far is "rare earth" (as in rare earth elements/metals). Most of these are found in china but i can stretch it to be found in other places as well such as south africa, us/canada, brazil, turkey etc (these places has traces of REE and planned or built extraction).
Any other idea? Something that can be needed for advanced units/aircrafts and/or buildings, but preferably has a real-world distribution and not just found in one place. (I know I can just invent some metal but i'd prefer to not do that). Or do you think the REE idea works fine?
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