80
My communist Sweden is doing very well
(lemmygrad.ml)
It is being ran as a council republic, with social democrats in charge (ew I know)
But everyone lives well, not exploiting any countries for it and am fairly peaceful. Only one war with norway really.
They allow you to invest in foreign countries now, and so you can develop the resources yourself if you want. You do need diplomatic treaties for it IIRC
Ah right, I don't have the DLC so I could still only do it through protectorates, which wasn't great. I assume those foreign countries also have to have the goods to support railways to export, which is probably a problem.