Feel free to start the comparison at a more recent year if you prefer. Let's say 1939.

Point taken, but if we nudge that to 1946... what have we got? Kosovo?

There were wars in most parts of former Yugoslavia, not just Kosovo. If the US pulls out of NATO (and I don't think we should), how long do you think it will take until the other European powers fall back on their old habits of killing each other? And don't presume to tell us some nonsense about how Europeans have changed and become more peaceful.

We're not in 1939, either. We're in 2025.