You don’t need the USA to be involved for a World War to start. If anything, a civil war in the USA could help spark one.
The peace built after World War II was mainly founded on American and Soviet force not intervening with each other, then American military dominance. Without a USA like power acting as a guarantor of the current international system, it is very likely that decades of pent up aggression will start to spill forward across the globe, including between other major powers.
You don’t need the USA to be involved for a World War to start. If anything, a civil war in the USA could help spark one.
The peace built after World War II was mainly founded on American and Soviet force not intervening with each other, then American military dominance. Without a USA like power acting as a guarantor of the current international system, it is very likely that decades of pent up aggression will start to spill forward across the globe, including between other major powers.