How and why NATO was created ?

We all Know NATO (North Atlantic treaty organisation) is one of the most powerful organizations in the world but How and why NATO get created?
Reference :
The story of the Berlin Wall. Creation to Fall of Berlin wall. बर्लिन वाल की पूरी दास्तान ( Hindi )
https://www.youtube.com/watch?v=oFbAJF7DWXc

North Atlantic Treaty
https://en.wikipedia.org/wiki/North_Atlantic_Treaty

Treaty of Brussels
https://en.wikipedia.org/wiki/Treaty_of_Brussels

Warsaw Pact
https://en.wikipedia.org/wiki/Warsaw_Pact

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Видео How and why NATO was created ? канала Gyan Jara Hatke