WW1 was truly unexpected-- all of the mutual alliances and it all being caused by a random assassination.<p>WW2 was more expected.<p>And, idk, I don&#x27;t have the benefit of hindsight, but I really doubt a world war in which the US is involved will break out this decade.  Like, with who?  Nukes &amp; M.A.D. have still changed the equation and made a conventional-weapons world war unreasonable.