What basic change did the breakup of the Soviet Union bring in the international power structure?

Shift from bipolar order toward unipolar tendency

The governing idea is the transformation of the post-Cold War international system. During the Cold War, global power was broadly bipolar, centred on rivalry between the United States and the Soviet Union and their respective alliances. The Soviet Union dissolved in 1991, ending that particular superpower confrontation. The United States then enjoyed a position of unmatched influence, so international politics showed a strong unipolar tendency, even though other powers and institutions continued to matter. Therefore option A is correct. The breakup did not revive the Roman Empire, restore colonial empires or begin the First World War; each of those options is historically unrelated to the 1991 change.

This is a Class 10 General Knowledge question. Chapter: World History. Topic: Important Historical Events.