It was, in other words, unlike anything in any of our lifetimes, probably unlike any year since 1848, when one street protest in Paris blossomed into a three-day revolution that turned a monarchy into a republican democracy and then — within weeks, thanks in part to new technologies (telegraphy, railroads, rotary printing presses) — inspired an unstoppable cascade of protest and insurrection in Munich, Berlin, Vienna, Milan, Venice and dozens of other places across Europe, as well as a huge peaceful demonstration of democratic solidarity in New York that marched down Broadway and occupied a public park a few blocks north of Wall Street. How perfect that the German word Zeitgeist was transplanted into English in that unprecedented, uncanny year of insurrection.