Article by Philip Brown
Has the UN succeeded in its principal goal?
The UN was formed after World War 2 “to save succeeding generations from the scourge of war”, . The first purpose of the UN is “To maintain international peace and security, and to that end: to take effective collective measures for the prevention and removal of threats to the peace, and for the suppression of acts of aggression or other breaches of the peace, and to bring about by peaceful means, and in conformity with the principles of justice and international law, adjustment or settlement of international disputes or situations which might lead to a breach of the peace.” 
And indeed there have been no world wars since the UN was founded. But some people would argue this had nothing to do with the UN and everything to do with the fear of the consequences of using nuclear weapons.
On the other hand there have been 478 wars in the 76 years since the UN was formed , a new one starting somewhere in the world every 2 months.
Can anyone really claim that the UN has saved succeeding generations from the scourge of war?
 UN Charter, Preamble: https://www.un.org/en/about-us/un-charter/preamble
 UN Charter, Article 1.1: https://www.un.org/en/about-us/un-charter/chapter-1
 List of wars 1945 – May 2021: https://unacov.uk/wp-content/uploads/2021/05/Wars-1945-May-2021.xlsx also available at https://docs.google.com/spreadsheets/d/1n3EM0o9jpaBZxUi_8_wAN61vp5XCSFKiSL0mU1ohttE/edit?usp=sharing
More information about armed conflicts since 1945
Prio.org publication, Trends in Armed Conflict, 1946–2017: https://reliefweb.int/sites/reliefweb.int/files/resources/Dupuy%2C%20Rustad-%20Trends%20in%20Armed%20Conflict%2C%201946%E2%80%932017%2C%20Conflict%20Trends%205-2018.pdf