Unfortunately, in the game it's not possible to create specific resources for each civilization. But one really cool thing I'm studying is that you migrate from one culture to another across eras. For example, the Jomon culture, which is the one I'm currently working on, existed from 10000 BC to 300 BC, then came the Yayoi who lived from 300 BC to 300 AD. The idea is that during this transition period you migrate from one culture to another through technologies.
Hello my friend, actually I haven't added all the resources yet. I still need to add bronze, silver, and replace the metals with iron. The idea of the game is to take the cradle of humanity from 10000 BC to 600 AD, going through all the civilizations and peoples of the planet. It's an ambitious project, I know, hahaha. So you will evolve through the ages... Flat stone, polished stone, copper age, bronze age, and iron age.