How often has the US been at not-war in that period?
EDIT: although to be clear, the last time I checked, I believe the stats still back up that overall fatalities from military conflict have been at historic lows. I generally prefer what little Hegemonic Stability there may be to the multipolar shitshows of the early 20th and mid-to-late 19th centuries.
Certainly wars between great powers and much smaller countries are more peaceful than near-peer wars.
Nope. Any reasonable person will accept an argument about how things are peaceful in relative terms. Factoring in everything and not cherry-picking.
Demanding perfect peace would be way too idealistic.
The argument can't be about overall fatalities, but about overall conflicts (and the numbers/proportion of people involved in such). Medical and sanitation technology alone has dramatically decreased the human-life cost of war, at least in proportion to total population.