<P> To defend North America against a possible enemy attack , Canada and the United States began to work very closely together in the 1950s . The North American Aerospace Defense Command ( NORAD ) created a joint air - defense system . In northern Canada , the Distant Early Warning Line ( Dew Line ) was established to give warning of Soviet bombers heading over the north pole . Great debate broke out while John Diefenbaker was Prime Minister as to whether Canada should accept U.S. nuclear weapons on its territory . Diefenbaker had already agreed to buy the BOMARC missile system from the Americans , which would be not as effective without nuclear warheads , but balked at permitting the weapons into Canada . </P>
<P> To defend North America against a possible enemy attack , Canada and the United States began to work very closely together in the 1950s . The North American Aerospace Defense Command ( NORAD ) created a joint air - defense system . In northern Canada , the Distant Early Warning Line ( Dew Line ) was established to give warning of Soviet bombers heading over the north pole . Great debate broke out while John Diefenbaker was Prime Minister as to whether Canada should accept U.S. nuclear weapons on its territory . Diefenbaker had already agreed to buy the BOMARC missile system from the Americans , which would be not as effective without nuclear warheads , but balked at permitting the weapons into Canada . </P>
where was canada during the cold war geographically-speaking
where was canada during the cold war geographically-speaking
North America
North America