Which of the following describes a major consequence of World War I in Europe?

• A. Birth rates declined markedly throughout much of western Europe.
• B. Nationalist tensions increased as the result of new political boundaries.
• C. Young Europeans left the Continent in large numbers.
• D. Reconversion to civilian production created an economic boom in most European countries.

Answer: (B)

The key idea is that World War I reshaped Europe’s political map, and those new borders sparked rising nationalist tensions. When empires collapsed, new nation-states like Poland, Czechoslovakia, and Yugoslavia were carved out, often placing ethnic and linguistic groups into the same state or splitting them across borders. The promise of self-determination collided with the reality that borders didn’t neatly align with where people actually lived, leading to minority grievances, disputes over territory, and competing nationalisms that remained a persistent source of conflict in the interwar period and beyond.

Other options miss this central consequence: birth rates and emigration occurred, but weren’t the defining outcome for Western Europe; and the postwar period did not bring a broad economic boom from reconversion to civilian production, given the widespread hardship, debt, and reparations that followed.