(A) 15 years war
(B) 25 years war
(C) 30 years war
(D) 35 years war
🧠 Explanation:
The Treaty of Westphalia (1648) ended the Thirty Years’ War, shaping modern statehood. Studying this highlights European history, a key topic in geopolitics. It underscores the rise of sovereignty, with implications for understanding international relations and modern nation-state systems.
