What was the war that led to the collapse of the European system?

Test answer: (1) political aspect: the capitalist system was established through bourgeois revolution and reform; Such as the French Revolution, German unification and Russian serfdom reform; Economically, it entered the industrial society through the industrial revolution. Ideologically, the Enlightenment provided a systematic political concept for capitalist countries. (2) World War II. (3) At the beginning of the 20th century, a world system dominated by European and American countries was formed; After World War I, in the 1920s, the Versailles-Washington system was formed, and Britain's world hegemony was challenged by the United States. After World War II, the traditional advantages of Europe ceased to exist, and the Yalta system constituted a new international pattern, forming a bipolar pattern between the United States and the Soviet Union. After nearly half a century of cold war, the drastic changes in Eastern Europe, the reunification of Germany and the disintegration of the Soviet Union at the turn of the 1980s and 1990s marked the end of the cold war between East and West, and the world pattern entered a new transition period.