Started on the summary section. Hmm. This could be more difficult than I thought. I'm pretty set on it being 100 pages (~50,000 words) At 3000 words a day, though, that won't take long.
Themes: Nationalism, technological change, colonization, international relations, and cultural changes. How 1870 sprang from and affected the past and the future is the overarching analysis. Was it really a turning point? How so? Evidence? Argument? Judgment.