Very interesting listen.
What I found particularly cool is that Rousseau's point - defining what constitutes a nation and that people unwilling to follow it should be forced to do so - while being wildly libertarian at the time, now sounds like something today's libertarians would be horrified of.
His points about Mazzini's ideology were beautifully argued
Your first duties - he told Italians - are towards humanity. You are men, before you are citizens.
Just beautiful. This does remind me how extremely modern his thought still is (something something European federalism)