We should admit that since then there's not been another war by major powers, this list is instructive: https://en.wikipedia.org/wiki/List_of_wars_by_death_toll

We should admit that since then there's not been another war by major powers, this list is instructive: https://en.wikipedia.org/wiki/List_of_wars_by_death_toll https://en.wikipedia.org/wiki/List_of_wars_by_death_toll Worst of that sort since then has been the great power proxy Korean and Vietnam Wars, which were very bad, but no on the scale of WWII, WWI, the Napoleonic Wars and the Thirty Years' War. The flip side is of course our reasonable expectation that eventually there will be one or more massively deadly nuclear wars.