Graphic and original concept from the Facebook page of Dmytro Degtyaryov, “100 Jahre Zurück,” used with permission: https://www.facebook.com/100jahrezuruck. English text adapted and expanded for genealogical and historical reference purposes by ThienemannArchive.org.
Note: The accompanying map is an AI-assisted historical infographic created for general visual reference purposes. It is intended to illustrate twentieth-century border and sovereignty changes affecting these cities and is not meant to represent exact historical boundaries or precise geographic locations.
Over the last 100 years, wars, border changes, and international treaties dramatically reshaped the map of Central and Eastern Europe. Many cities that were once important cultural, industrial, and economic centers of Germany are today located in other countries. For genealogists and historians, understanding these historical place-name and border changes is essential when researching family records, documents, and archives.
Here are ten of the largest and most historically significant cities that were formerly part of Germany during the twentieth century.
1️⃣ Königsberg (today Kaliningrad, Russia 🇷🇺)
The historic capital of East Prussia and home of philosopher Immanuel Kant. One of the most important cities of the former German East, it became part of the Soviet Union after the Second World War.
2️⃣ Danzig (today Gdańsk, Poland 🇵🇱)
A major Baltic seaport and famous Hanseatic city. Its political status after the First World War became one of the major sources of tension between Germany and Poland during the interwar period.
3️⃣ Breslau (today Wrocław, Poland 🇵🇱)
Until 1945, one of the largest cities in Germany. Breslau was an important cultural, architectural, and university center of Silesia.
4️⃣ Straßburg (today Strasbourg, France 🇫🇷)
The principal city of Alsace, with a long and complex French-German history. During the period of German administration, the monumental Neustadt district was constructed.
5️⃣ Stettin (today Szczecin, Poland 🇵🇱)
A major port city of Pomerania located near Berlin. Following the border changes after 1945, the city became part of Poland.
6️⃣ Memel (today Klaipėda, Lithuania 🇱🇹)
The northernmost port city associated with East Prussia. After the First World War, the Memel Territory was separated from Germany and later became part of Lithuania.
7️⃣ Mülhausen (today Mulhouse, France 🇫🇷)
An important industrial center in Alsace whose sovereignty shifted multiple times between France and Germany.
8️⃣ Allenstein (today Olsztyn, Poland 🇵🇱)
One of the principal cities of southern East Prussia, with deep historical ties to German and East Prussian heritage.
9️⃣ Elbing (today Elbląg, Poland 🇵🇱)
An old Hanseatic city and an important commercial center of historic East Prussia.
🔟 Gleiwitz (today Gliwice, Poland 🇵🇱)
A major industrial city of Upper Silesia, known historically for the 1939 Gleiwitz radio station incident that became one of the pretexts for the outbreak of the Second World War.
🕊️ Many of these cities still preserve German-era architecture, churches, town halls, cemeteries, and traces of their multicultural past. Today they belong to different nations, yet they remain part of the complex and interconnected history of Europe.
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