I get the idea that that treaty was what defined a "nation state" in today's usage of the word, no? I think we studied that in Western Civ II (a class at community college I took).
I understand Kissinger wrote another book that was specifically about the Congress of Vienna/Concert of Europe period. It had a long title and I think it was originally his Harvard doctoral thesis.
I won't get into a debate about Kissinger himself, that would get us a bit off topic. He certainly has his supporters and detractors.
I'm also familiar with his book "Diplomacy", of which I read a couple of chapters.