I don't think WWII happens without WWI and the interregnum clearly contributed to igniting WWII in many ways. Conditions after WWI never fully cleared to a period of world peace. More like, world divisions and clashes outside of global war. Then fascism and the Nazi rise, etc.

Edit-to be clear, this is a good moment to reflect on the tendencies towards war in the current era. It's the time to push back. Certain forces are clearly pumping out "accelerating" propaganda via the internet. Those same forces clearly have territorial disputes in mind along with global aspirations. The time to counter them is now, before WWIII fully ignites.