For what purpose was the North Atlantic Treaty Organization (NATO) founded, and how did the Soviet Union respond?

The North Atlantic Treaty Organization was created in 1949 by the United States, Canada, and several Western European nations to provide collective security against the Soviet Union. NATO was the first peacetime military alliance the United States entered into outside of the Western Hemisphere.

Alarmed by this behaviour, a number of nations formed NATO as a defensive alliance in 1949. ... As a result, the Soviets created the Warsaw Pact -- compelling their client states to "join" a "defensive" alliance allegedly in response to the new NATO threat.

they have different colored collars

b]to spread the message of black power