Civ Unlocks

u/sar_firaxis mentioned yesterday that every civ will have either a resource or gameplay unlock. I'm not sure if "gameplay" unlock just refers to the leader and historical paths we've already encountered or something different, so I'll leave that speculation to others. But it occurred to me (I may be slow) that a big hint about what those resource unlocks will be can probably be gleaned from a civ's start bias. The only resource unlock we know about so far is horses -> Mongolia, and sure enough Mongolia has a horse start bias. What about the other civs?

In the Exploration Age, the civs with resource start biases are:

Abbasid - camels

Majapahit - spices

Ming China - silk

Mongolia - horses

Normans - iron

Chola, Hawai'i, Inca, Shawnee, Songhai, and Spain all just have terrain biases.

In the Modern Age so far:

France - wine

Russia - furs

And there's America, Mexico, and Qing China with just terrain biases.

So, roughly half have potential resource unlocks. Of the remaining modern civs, do any stand out as being tied to a resource?

Mughal - saltpeter/niter?

Siam - ivory/elephants?

Buganda - ?

Meiji Japan - ?

Germany - ?

England - Coal?