If Canada was an ally of the US during the cold war it likely belonged to A. the Second World
B. the First World
C. the Third World
D. the Fourth World

Canada's entry into the Cold War came with the disclosure in 1946 of a spy ring led by Igor Gouzenko. Involvement in NATO and support for the UN led Canada to be an active participant in the Korean War in 1949. In 1949, the Soviet Union detonated its first atomic bomb, and the age of superpowers was launched.

the berlin blockade was an international crisis that arose from an attempt by the soviet union, in 1948–49, to force the western allied powers (the united states, the united kingdom, and france) to abandon their post-world war ii jurisdictions in west berlin. in march 1948 the allied powers decided to unite their different occupation zones of germany into a single economic unit. in protest, the soviet representative withdrew from the allied control council. coincident with the introduction of a new deutsche mark in west berlin (as throughout west germany), which the soviets regarded as a violation of agreements with the allies, the soviet occupation forces in eastern germany began a blockade of all rail, road, and water communications between berlin and the west. on june 24 the soviets announced that the four-power administration of berlin had ceased and that the allies no longer had any rights there.