Have you read S.M. Sitrling's "Change" novels? Distantly related to Ringo's trilogy [which actually is no longer a trilogy] The Council Wars [a couple of the books are There Will Be Dragons, The Emerald Sea]
Also not to be overlooked is Weber & Ringo together writing a quatrilogy [??] which begins with the novel March Upcountry.
Sterling and Ringo are especially useful as well as entertaining, as they take place in societies where there is suddenly a complete drop in the level of technology. In Stirling's, no chemical reaction more complicated than fire will work. It just doesn't. In the Weber/Ringo books, there is very, very little political discussion but the "reinventing technology" theme is excellent.
Oh, how the heck could I forget Eric Flint and the Grantville books? The first one is 1632; the second is 1633, and it diverges from there. A "chunk" of West Virginia is suddenly transferred to 1632 Germany and the Americans decide to invent the United States early. Lots of political theory and history, as well as interesting technological solutions.

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