Not sure if it’s what you’re looking for but I’m enjoying The Iron Heel by Jack London right now, it’s an early sci fi book about a failed revolution in the US basically. But it’s quite expository and has lots of speeches, that early 20th century socialist style. But the conceit of the novel is very cool in my opinion–you’re reading the journal of one of these future revolutionaries annotated by a historian in a future utopian society.