Answer:
An unfounded anxiety shared by people who can be scattered over a wide geographic area is called "Mass Hysteria".
Step-by-step explanation:
Mass hysteria is the sociopsychological phenomenon that comprises the manifestation of the same or similar hysterical symptoms by more than one person.
A common manifestation of mass hysteria occurs when a group of people believe they are suffering from a similar illness or ailment. Thus, the group usually shows enthusiasm or anxiety, irrational behavior or unexplained symptoms of some disease.