A significant change in the global balance of political power in the period 1900 C.E. is that it always depended on alliances and coalitions in global conflicts and now slowly shifting to nuclear power.
The balance of power in the 20th century has always depended on alliances and cooperatives in global conflicts.
Though, we can see there was a change in the mid-20th century from the dynamics that prevailed mainly within Western Europe to the scale of the Cold War between the Soviet Union and the USA.
Thus, It mainly discusses the continuity of persistence of European power (continuity) in the context of imperialism and the rise of new powers because of the nuclear weapon (change).
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