Romeo and Juliet 'star-crossed lovers'

Explain the ways in which Romeo and Juliet were "star-cross'd lovers."

Romeo and Juliet, is a tragic love story about two young lovers, Romeo and Juliet who are innocent victims of fate.
The Chorus introduces the power of fortune in the opening prologue, when it stated that Romeo and Juliet are “star-crossed” (destined for bad luck) and “death-marked,” and that their death will end their parents’ feud.
The opening lines of Romeo and Juliet also speak of an “ancient grudge,” which the characters in the play are born into. Throughout the play, there is evidence that the lovers’ misfortune occurs because of coincidence and misunderstanding. Romeo and Julie did not have a choice in what they desired, they were destined to participate in the conflict and death.

Romeo and Juliet were star-crossed lovers because it was fate that they were born into opposing families.
In the Prologue the Chorus explained that the Capulets and the Montagues are enemies...