Epochs of History in My Homebrew Setting

Recently, when I was writing my most recent D&D character's backstory, I found myself describing certain periods of history as part of my character's work at a museum. Though the history was not the focus of my writing, I really enjoyed devising ways to think about history in the world. I want to take that same concept and apply it to my own world rather than my DM's; this article is a guide to the various epochs of history in my homebrew setting, Evanoch. 

One of the most important features of understand your world's history is that it creates a great deal of additional detail you wouldn't have access to without having worked on it. It's especially helpful in understanding social movements, which is very much at the heart of how I write my stories. My goal in devising these periods will be showing a progression of ideas, and most importantly, a guide to the changes in everyday life in my setting.