6 Instances of Mass Hysteria in the United States

Salem Witch Trials (1600s)

1. Lynching in the United States (1860-1960

2. The Red Scare and The Palmer Raids (1919-1920)

3. Japanese American Internment during WWII (1942)

4. The Second Red Scare (1940s - 1950s), McCarthyism, Joe McCarthy and the Blacklist

5. Satanic Day Care Scandals (1980s)

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(Biography.com)