How did nationalism contribute to the growth of United Nations membership after 1945?

After 1945, nationalism served as a primary catalyst for the expansion of the United Nations, largely by fueling the global movement for decolonization and self-determination.

As nationalist movements in Asia and Africa gained momentum, they challenged colonial rule and sought to establish independent nation-states. The United Nations actively facilitated this transition, notably through the 1960 Declaration on the Granting of Independence to Colonial Countries and Peoples, which condemned foreign subjugation and supported the right of peoples to choose their own governments.12

This process fundamentally transformed the organization's membership:
* Rapid Growth: From 51 original members in 1945, the UN expanded to include over 100 new nations by 1980, the majority of which were newly independent states from Asia and Africa.3
* Shifting Influence: As these new states joined, they exerted increasing power within the General Assembly, forming regional voting blocs to advance their shared principles and interests.1
* Post-Cold War Expansion: Following the collapse of the Soviet Union in 1991, nationalism again drove membership growth as many former Soviet republics gained independence and joined the UN.45

By championing the principle of self-determination, the UN provided a formal international framework for these nationalist aspirations to be realized as sovereign statehood.12