Ow does Tennessee Williamas use the conflict between Stanley and Blanche to create such a powerfully tragic play?

I will be judged on the following criteria. I will be expected to:
a?Write in essay form and construct arguments relevant to the task(s)
a?Offer textual evidence to support your arguments
a?Use critical vocabulary to discussions of tragedy and the chosen texts
a?Show awareness of how dramatic form and structure contribute to the tragic genre
a?Show awareness of some of the details of represented speech, including imagery Shakespeare and the representation of social status in Shakespeare and other plays
a?Cross reference to other plays as part of your discussion of tragedy
a?Show awareness of different interpretations in areas such as status of tragic heroes and definitions and sub-definitions of your chosen texts within the tragic genre
a?Show awareness of literary and cultural contexts within notions of tragedy
a?Show awareness of other appropriate contexts (such as social, moral, religious and political) that may be applicable

Referencing Requirements:
Book/Play: A Streetcar Named Desire
Author: Tennessee Williams
Edition: No preference

One criteria is Cross reference to other plays”. This can be left to the discretion of the writer to decide with book(s) to cross reference with. I am also studying King Lear so this might be a good option.