As a result of fears regarding the Cold War, many Americans

a. urged Congress to declare war on the Soviet Union.

b. built bomb shelters in their backyards.

c. supported Senator McCarthy well into the 1960s.

d. voted for Harry Truman in the election of 1952.

The answer is: b. built bomb shelters in their backyards

With the fear of a devastating nuclear war between the US and the Soviet Union product the Cold War, many Americans sought ways to protect themselves in case of a nuclear attack, one of the ways of doing so was building bomb shelters, also known as "Fallout shelters" were they could potentially live underground for an extended period of time in order to shelter themselves from the nuclear fallout.