Blackbird_SR-71
Spying from 85,000 ft
this is a easy implentation but can add great depth:
when you research the tech Nationalism there should be some new effects:
1) When you go to war any new nation identity citizens should last much longer and be resistors longer and be unhappy like they are currently
2) When you research the tech, some of the citizens of the national identites that had assimlated into your country would become their own nationalities again and cause unhappiness and maybe seperate from your nation.
3) this would unify countries that have one nationality while dividing and weakening countries with diverse nationalities
when you research the tech Nationalism there should be some new effects:
1) When you go to war any new nation identity citizens should last much longer and be resistors longer and be unhappy like they are currently
2) When you research the tech, some of the citizens of the national identites that had assimlated into your country would become their own nationalities again and cause unhappiness and maybe seperate from your nation.
3) this would unify countries that have one nationality while dividing and weakening countries with diverse nationalities