According to K.J. Holsti, which one of the following is not a feature of the contemporary state system ?

In K.J. Holsti's classic Cold War textbook International Politics: A Framework for Analysis (1967), the contemporary international system is characterized by the proliferation of new states, nuclear destructive capacity, and alliance blocs, whereas predominance was exercised by the two non-European superpowers—the United States and the Soviet Union—rather than a triumvirate including China.