TheoTown

1997:
After the collapse of the Imporian Union, 61 small kingdoms and republics (52 were the former Arstotzkan provincies. The rest belongs to Iridane Republic.) declared independence from the Imporian alliance, and their relations between each other broke apart.

2001:
After the collapse of the Iridane Republic, the 52 small states agreed to make an alliance called "Arstotzkan league".

2005:
The Kolechian Empire (East Iridane) was formed.

2009:
Because of the Kolechian Government's influence, the relations between the 52 small states broke apart again, and the "Arstotzkan league" was dissolved.

2012:
The 52 small states agreed to make a union for their closest neighboors only. This lets to the creation of:
Grestin Union
Northern Union
Western Union
Eastern Union
Southern Union

2015:
Because of the rising tensions between Kolechia, the 52 small states, once again, agreed to make one union called "Arstotzkan League of Nations".

2018:
The 52 small states agreed to unite and form an empire. The Arstotzkan Empire was formed.

NOTE:
This history is related to the Svostine-Iridane Great War and the collapse of Iridane. However, this doesn't make sense if you looked the TheoTown world map (By The Fennekin, and then A Guy From Shireport.)