The First World War profoundly reshaped East-Central Europe. On the ruins of four collapsed empires, a dozen new states emerged, and almost all borders were redrawn — often through continued military conflicts lasting until 1923. Despite severe human and material losses, societies across the region began rebuilding, modernising, and creating new political and social structures. It was a turbulent and dynamic era, crucial for understanding 20th-century history.
Timeline of events from different perspectives
30 October 1918
Slovakia: The Martin Declaration
Read more
30 October 1918
The Outbreak of the Chrysanthemum Revolution in Hungary
Read more
1 January 1919
Fights for the borders of the Second Polish Republic
Read more
21 March 1919
Declaration of the Hungarian Soviet Republic
Read more
28 June 1919
Germany: Signing of the Versailles Peace Treaty
Read more
4 June 1920
Hungary Signs the Treaty of Trianon
Read more
18 April 1920
First democratic parliamentary election in Slovakia
Read more
4 June 1920
Trianon borders of Slovakia signed
Read more
13 August 1920
Poland: Battle of Warsaw
Read more
28 October 1920
The Paris Peace Conference and its consequences for Romania
Read more
17 March 1921
March Constitution in Poland
Read more
22 January 1922
First proposal for Slovak autonomy
Read more
11 January 1923
Germany: Beginning of the Occupation of the Ruhr
Read more
27 March 1923
Romania: Consolidation of the Great Union. The Constitution and the internal legislation
Read more
9 November 1923
Hitler unsuccessfully attempts to gain power in a putsch
Read more
In this lesson you will find teaching resources for history educators that help students explore the key developments of the post-war period:
-
Catalogue After the Great War — a comprehensive overview of the era, including the consequences of the war, new borders, elections, plebiscites, social relations, and diplomacy.
-
Children’s Perspectives — a set of five thematic modules examining how the First World War affected children’s lives. This resource highlights how the turbulent post-war years shaped young people, using a wide range of historical sources, mainly photographs and documents.