Which region experienced some of the most transformative border changes and nation-building after WWI?

• A. Western Europe
• B. Central and Eastern Europe, including Poland, Czechoslovakia, Yugoslavia, and the redrawing of borders around Germany and its neighbors.
• C. The Mediterranean Basin
• D. Scandinavia and the Baltic States

Answer: (B)

The big idea is that World War I sparked a dramatic redraw of borders and a burst of nation-building in Central and Eastern Europe. With the dissolution of the Austro-Hungarian and Ottoman Empires, old rule-based borders gave way to new nation-states and frontiers that often aligned with ethnic and national identities. Poland re-emerged as an independent country, Czechoslovakia was created from Czech lands and Slovakia, and Yugoslavia united various South Slavic groups into one state. At the same time, borders surrounding Germany and its neighbors were redrawn through peace treaties, carving out new territories and redefining the map of the region. The Paris Peace Conference and treaties like Saint-Germain, Trianon, and Neuilly cemented these changes, even as some of the borders bred future tensions and minority issues. While other regions did experience shifts, the scale and speed of border changes and the subsequent nation-building in Central and Eastern Europe were the most transformative.