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The fact that the Capulet and the Montague family have been fighting forever is one idea.
The foreshadowing in Act I includes the fight that Tybalt and Benvolio get involved in; this foreshadows the later fight between Mercutio and Tybalt. The second is the punishment of the Prince; he is the boss and can make the people of Verona behave the way he wants. Although he does not kill Romeo after Romeo kills Tybalt, the Prince simply exiles Romeo which foreshadows that awful things will happen after the fight that occurs in Act III.