There are different kinds of events. An historical event, such as the terrorist attacks in New York in September of 2001, would be considered by Bronfenbrenner to fall within chronosystem.
The chronosystem event is known or seen as how and when some key events takes place and how the timing of these events can affect human life.
Conclusively, These key events could be within the individual's life itself or external forces such as natural disasters, pandemics, etc.
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