You might want to look into Jancis Robinson's Oxford Companion to Wine for this one ... it's a bit too specific for this board or for a reply on this thread.
To summarize, I would probably put the development into four stages: post-war recovery era (elegant, balanced wines but quality largely dependent on vintage), mass-production era (70s -- bad quality all around), revival era (renewed focus on quality and reduced yields in the 80s), and post-modern era (90s to present, with a good deal of winemakers slowly converting the more international 'Parkerized' style of wine).
Hope that gets you started. There are lots of great books written on this exact topic out there in academic libraries ... if you can get your hands on the one by M-H Lemay, you're in luck! It's a rarity but it should really help you out.