Dissertation Proposal- (?)

After meeting with our semenar group I'm starting to become slightly, ever so slightly more confident in finding a topic which suits me for my dissertation. I discovered half way into our last essay that maybe the subject "Culture & Design" was a tad vague to discuss in depth and to explore the reationship between the two.
However I'm still keen on considering this as a basis to begin my research for my final idea.
I'm interested in the way that cultures have been manipulated and expanded, particulary in the past centuary. I thought it could be interesting to discuss what triggered these changes and consider the key events in history that have become a catalyst for social change.
Pro-active !