What threat brought about the formation of NATO?

It was formed in 1949 to provide collective security against the threat posed by the Soviet Union. ... One of the founding principles of NATO is Article 5 of its charter, which states that an armed attack on one member nation would be considered as an attack on all.

Explanation:

b. 20: 5

explanation:

20% of the worlds population lives in southwest asia, and less than 5% of the world's

land area.