Answer :
The three events that led to an increased emphasis on security during the period from 1930 through the mid-1980s were: the Great Depression, World War II and Cold war.
The Great Depression was the worst economic downturn in the history of the industrialized world. It began following the October 1929 stock market crash, which sent Wall Street into a panic and wiped out millions of investors.
World War II was a global conflict that lasted from 1930's to mid 1940. The vast majority of the world's countries, including all of the world's great powers, formed two opposing military alliances: the Allies and the Axis powers.
The Cold War was an ongoing political rivalry that developed after World War II between the United States and the Soviet Union, as well as their respective allies. It increased emphasis on security.
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