When did the North Atlantic Treaty Organisaton (NATO) come into existence?

April 1949

*The correct answer is Option 1 - April 1949*

The Western alliance was formalised into an organisation, the North Atlantic Treaty Organisation (NATO), which came into existence in April 1949. It was an association of twelve states which declared that armed attack on any one of them in Europe or North America would be regarded as an attack on all of them. Each of these states would be obliged to help the other. The eastern alliance, known as the Warsaw Pact, was led by the Soviet Union. It was created in 1955 and its principal function was to counter NATO’s forces in Europe.