Research Papers / Why rules and laws change in time - how Law is influenced by Social Change (research start) [4]

Help starting an essay on how Law is influenced by Social Change.

So I have a paper due on Friday at 8:30 AM.

We were given several topic questions, and the one that I have is:
Discuss the relationship between law and social change: does law follow or initiate social change?
Give examples. Does change in society transform the law or does the law transform society? Discuss.

My professor has asked us to write a 5-7 page essay answering that question.

I wrote a proposal for this earlier in the month (Can be read here: goo.gl/w015RO)

The issue I'm having now is that I have no idea what to do. Despite writing a proposal... I can't think of what I want to talk about, I've wasted countless hours sitting in my university's library without a clue about what to do.

All I'm looking for right now, is for someone to talk to me and help me formulate a basis on which I can research and eventually write about, or help structure my essay.

I'm beyond confused and lost...