NS coins and colectables maybe?

[Marxist Germany]

To further the idea I was thinking you unlock collectibles through answering issues. Every nation would have a national treasure vault page where you would view what they collected so far.

Banners serve this very purpose.

[Mathuvan Union]

To further the idea I was thinking you unlock collectibles through answering issues. Every nation would have a national treasure vault page where you would view what they collected so far.

Banners serve this very purpose.

Banners are boring. You have to wait forever to get through them all.

[Odinburgh]

To further the idea I was thinking you unlock collectibles through answering issues. Every nation would have a national treasure vault page where you would view what they collected so far.

Banners serve this very purpose.

Worthy point

[Merni]

Banners serve this very purpose.

Banners are boring. You have to wait forever to get through them all.

If you want to showcase a particular banner, you can easily set it as your primary banner, or just reduce the number of active banners (even to 1).
I can't think of any other customisation that would be better done by making it an unlockable game feature than by simply making a factbook.

[Noahs Second Country]

To further the idea I was thinking you unlock collectibles through answering issues. Every nation would have a national treasure vault page where you would view what they collected so far.

That's all of your stat badges, government information, policies, and banners.

Most of the game is already centered around giving you stuff for answering issues