Provide two arguments for why the war on terrorism might become a period effect

What will be an ideal response?

An ideal response will:
1, Define period effect as an event that influences the attitudes and beliefs of people of all ages. (May reference the period effect displayed in Figure 7.1.)
2, Provide two ways in which the war on terrorism has changed public opinion across all age groups. This may include how this event similarly impacts all age groups' views of military spending or foreign policy.