Czechoslovakia

1918 - 1948

The new Czechoslovak Republic brought democracy to Plzeň but demographic rupture to the borderlands. The Sudeten German minority, concentrated in the Karlovy Vary and Cheb districts, felt excluded from the new state. The Munich Agreement of 1938 made the Sudetenland part of Nazi Germany overnight; Karlovy Vary became Karlsbad again. During the occupation, the Great Synagogue was spared physical destruction only because the Nazis designated it as storage for their planned 'Museum of the Extinct Jewish Race' — the building survived, its community did not. On May 6, 1945, Patton's Third Army liberated Plzeň and western Bohemia — a fact that would be suppressed for 41 years under communism. The post-war Beneš decrees authorized the forced transfer of over three million German speakers from Czechoslovakia. In western Bohemia, the demographic transformation was nearly total: entire towns like Karlovy Vary and Cheb lost virtually their entire populations. The spa traditions, folk customs, and church festivals of German-speaking communities were erased, replaced by the traditions of Czech and Slovak settlers who arrived to fill the empty towns. This was not a simple liberation but a cultural rupture of extraordinary completeness.

1918 - 1948

When Košice joined Czechoslovakia in 1918–1920, the Hungarian majority became a minority overnight. The Beneš Decrees (1945) revoked citizenship of Germans and Hungarians, and the 1946 Czechoslovak–Hungarian population exchange forcibly transferred between 45,000 and 120,000 Hungarians from southern Slovakia — including the Košice and Zemplín areas — to Hungary. The Zipser Germans of Spiš, who had built Levoča, Kežmarok, and Spišská Kapitula over seven centuries, were expelled. Their architectural heritage remained but their living community was reduced to the tiny village of Chmeľnica (Hopgarten), where Outzäpsersch is still spoken. These population transfers fundamentally reshaped the cultural landscape: Hungarian-language civic traditions were suppressed, and the multi-ethnic urban culture of Košice was replaced by a Slovak-majority city. The Greek Catholic Church maintained its Rusyn parish network through this period, and Medzilaborce district remained overwhelmingly Greek Catholic (Roman Catholics only 8.7%).

1918 - 1948

The creation of Czechoslovakia in 1918 and the Treaty of Trianon (1920) drew a new border through the Danube lowlands, splitting Komárno-Komárom into two countries and placing large Hungarian populations under Slovak administration. Before WWI, nearly 900,000 Hungarians lived in what is now Slovakia (about 30% of the population); today their numbers have been halved by mixed factors including land reform, population exchange (1947–48: 45,000–120,000 Hungarians transferred), and assimilation. Komárno—56.69% Hungarian by 2021—became the center of Hungarian institutional life in Slovakia, later hosting J. Selye University (2004), the first Hungarian-language university since 1919. In Nitra, the 1933 Pribina Celebration became a major demonstration against Czechoslovakism, revealing how medieval origin narratives were already being mobilized for modern national politics. The dual place-name layer—Slovak/Hungarian, sometimes German—became a visible memory of shifting sovereignty, with market-day elements in names like Dunaszerdahely/Dunajská Streda and Érsekújvár/Nové Zámky encoding older functions.

1918 - 1939

The collapse of Austria-Hungary in 1918 threw Zakarpattia into a brief limbo before it joined Czechoslovakia as 'Subcarpathian Rus'' — the only region in the new state with promised autonomy. Uzhhorod became the regional capital; Khust emerged as the center of the autonomy movement. In October 1938, the region gained self-government; on March 15, 1939, Voloshyn declared 'Carpatho-Ukraine' independent — and Hungarian troops crossed the border the same day. The renaming itself remains contested: Ukrainian nationalists see it as rightful, Rusyn activists as erasure. Climb to Khust Castle's ruins: from here, Voloshyn's government broadcast its short-lived declaration — the stone walls frame a view of the river valley that was, for one day, a national border.