Earlier quoted context omitted.
Historically a more multipolar world has been a more violent and chaotic world, but maybe this time will be better.
Well I wouldn't say it's peaceful now, or has been in the past... Actually there's few years that the US wasn't at war.
Not to say there isn't war, but they're small wars with a million deaths being a big one.
More people died in Second World War[1] than in all wars since then combined. If not for the Russian Civil War and WW2, the same would probably true for the Great War.
War is terrible, but the fraction of people who died in wars the last 75 years is substantially smaller than the 75 years before that and I do think that is worth celebrating. I am not confident this will hold for the next 75 years
[1]: https://en.wikipedia.org/wiki/List_of_wars_by_death_toll