What are events that influence groups of people during the same years, such as the influence of World War II on the "GI Generation"?

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Cohort effects refer to events that influence groups of people who are born during the same time period. This includes events like World War II, which had a significant impact on the generation of people who fought in the war (known as the "GI Generation"). Period effects refer to events that influence all people at a certain point in time, such as the COVID-19 pandemic. Rites of passage refer to ceremonies or events that mark a significant transition in a person's life, such as graduations or weddings. Aging effects refer to changes that occur as individuals age, such as declines in physical or cognitive abilities.

What Are Events That Influence Groups of People During the Same