I think it is a question of definition
A world war of many countries actually suffering the consequences
Or many countries from around the world participating in a war
The Kuwait war was an example had 34 nations involved in some degree or another
And 2003 Iraq Invasion had the so-called “Coalition of the Willing”
There are many alliances happening …NATO IN Afghanistan, OAU France, UK and US in the Sahel…Libya and Syria with foreign combatants …less national and now more international conflicts
Also, we have to consider war by mistake and error, accidental incidents and miscalculated gambles.
Capitalism lays down the conditions for a war to break out but in many cases actual events are not so well planned or premeditated.
What is often said is that war between two full democracies has ended…