Former countries of New Era

Great Ideological War
Northenian Imperium (NI) - Tier 4, During the Great Ideological War, Fascistic army of II Invaded them. After the war, they splited into 3 parts.

Fascistic Front of the Irenilian Imperium (FFII) - Tier 4, defeated in the war and splited between II and SI.

Monarchistic Irenil (MI) - Tier 4, after the war, they joined back the II.

East Technorian Imperium (ETI) - T4, splited between TI and XI - TI: Ekvalian-Ekvestian Imperium (EEI), XI: Ekvanilian Imperium (EI)

Liberation wars
United Kingdoms of Ardonia (UKA) - Tier 3-4, In the Great Ideological War, after TI invaded them, they turned into Federation.

Second Irenilian Civil War
Imperium of Region 18 (IDK when this happened) - After accesion of Samson Pennix (Aureilis), IR18 turned into Aureilian Imperium ruled by Samson Pennix-newly named just Aureilis

Midnightian Imperial Union (MIU) - Union of western O'perilic countries, with the start of the unification talks, they renamed to O'perilic Provisional Authority and then unified with Xirianilian Imperium, proclaiming the O'perilic Imperial Order

Interwar Period
Federated Kingdoms of Ardonia (and then Federated Kingdoms of Ardonia and Nadiria) - Established after the Great Ideological War after the Technorian inavasion of the UKA. It was reformed into Federation of Ardonia and Nadiria.

Federation of Ardonia and Nadiria - This was a short lived country that is now part of the Aternosian Federation.

Kingdom of Polnia - Turned into Republic of Polnia.

Kingdom of Cristinia - Turned into Republic of Cristinia.

Technorian reunification
Northenian-Phenixian Imperium - not sure if it is in this period, but I need to get rid of it.

Technorian Republic - Changed into the All-Technorian Council and the integrated into Technorian Imperium