Which is one way the us government responded to the fear of nuclear war in the postwar years?

By advancing technology and making the US a stronger nation. Technological advancements during this time were made to intimidate Russia. We made nuclear weapons, bettered our army, and even created NASA to scare other countries so they wouldn't want to mess with us. The era of time in which these events occurred is known as the Cold War, and it did not end until the 90's.