Big if true

Were there any wars that started before the first World war, but ended after? Because technically, The quote doesn't say it prevented wars, just ended them.

You could make a strong case that the second world war came close though.

We've never seen warfare on that scale before, where one group of allies is fighting another, the closest is Ukraine, where two countries each have allies supplying weapons and other supplies.

Chinese Civil War pII?
Korean War?
Vietnam War? ::: spoiler Tap for spoiler and Secret War and Third Sino-Vietnamese War? :::
6 Day War?
Somalian Civil War?
Nigerian Civil War?
Yemeni Civil War?
- We have dubbed this span since 1945 "the long peace" which largely this refers to there not being 2 or more wealthy nations in a hot war since the end of WW2. It's been proxy wars pitting poorer nations against each other - armed by rich nations, and wealthy nations going to war with poorer nations. (Poorer nations going to war and civil wars nonwithstanding because they do not impact global politics)
- 75 million people is the estimated death tool of WW2.
  For comparison Vietnam war has an estimation of 1.3 million deaths.
- The fact that most of those are considered a "civil war" should tell you everything.
  WW2 involved multiple nations on both sides, and resulted in millions of deaths. The closest to that was the Korean War, which had Russian pilots flying for Korea, and flying from Chinese bases.
  Like I said, nothing on the scale of ww2.

OOTL - What show is this?

Cunk on Earth
- A sublime combination of Diane Morgan and Charlie Brooker. Absolutely the best comedy to appear in the past decade.
- Created by Charlie Brooker of Black Mirror fame? Okay, I'm in.
- Thanks!
Cunk on Earth

After the 2nd world war, we said surely this is the last big one, with understanding that ww4 would be fought with sticks and stones.

we might have thought nazi ideology would be gone too, but we decided to cognitively coherently separate pro US/NATO nazis from anti-NATO nazis, chasing ghosts of communism and warmongering towards nuclear powers became the cool thing again so easily.