The Godfather is set in 1945, with Vito Corleone as head of the family. The Godfather II, on the contrary, follows two different timelines. On the one hand, a "present" timeline in 1958, with Michael Corleone as head of the family. On the other hand, there is a flashback timeline following Vito Corleone’s early life events for almost 30 years. More @Wikipedia
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