Dawn of the Patriot

I'm playing a Dawn of the Patriot event game (#4,050,512), and 40% of my provinces that have resources don't produce. The resource marker is greyed out. Only one of the 1xResource provinces produces anything, along with Urban (2xResource) production. If I capture non-urban enemy resource provinces, most of them don't produce either. How do I make them produce? Or is the greyed out resource symbol just a teaser to create frustration?