I asked ChatGPT to compute the rate of total deaths (civilians + military) since the end of the Napoleonic Wars.

Here's what it came up with:

    Period.     Approx average deaths from war
    1815–1913 ~5–15 per 100k per year
    1914–1945 ~100–200 per 100k per year
    1946–1989 ~5–10 per 100k per year
    1990–today ~1–3 per 100k per year

I know AI is not 100% reliable but it searched on many sources to compute that. I checked some of them and the conclusion is in line with them.

Here's the "bottomline":

> Since the end of the Napoleonic Wars, the per-capita death rate from war has fallen substantially, with the huge exception of the 1914–1945 world-war era, which produced the highest war mortality rates in modern history.

TBH this surprised me. I thought that with much better killing machines in the 20th century, we'd be more efficient at killing, and as we're still having wars as usual that would mean death rates would increase... but it seems I was quite wrong.