1959-02-20
Canadian prime minister John Diefenbaker cancelled the Avro CF-105 Arrow (pictured) interceptor-aircraft program amid much political debate.
1957-06-10
Led by John Diefenbaker (pictured), the Progressive Conservative Party won a plurality of House of Commons seats in the Canadian federal election.
1950-11-21
Two trains collided near Valemount, Canada, killing 21 people; the subsequent trial brought future prime minister John Diefenbaker to greater political attention.