I went ahead with the classical and medieval section, and on the main page, added a bunch of links into social structure and change and social institutions. But when I look at specifics, this section is also mostly frozen.
I also did some work on the main modern history page, again mostly adding links into the social structure and change and institutions. I also did some writing in the various sections related to particular peoples that, as I think about it, needs to go in different sections from where I put it. I didn't get to tackling the individual centuries of the modern period yet, but those are coming up.