> Classical realist theorists, such as Hans Morgenthau and E. H. Carr, hold that multipolar systems are more stable than bipolar systems, as great powers can gain power through alliances and petty wars that do not directly challenge other powers; in bipolar systems, classical realists argue, this is not possible.
I suppose they must account for this somehow but isn't that exactly what a series of proxy wars in far-flung places between the United States and the Soviet Union were?