Sounds fun. I made a Star Wars board game, among others, when I was a kid. Every so often I think about a game I would like to make.
I'm finding maps of specific resources: coal, oil. You can find pretty good maps on the state level, using government websites like the USGS as a portal. The USGS website is such a mess, but I suspect there are useful maps lurking in it. There is also the eia.
Sounds like a pretty big game :D