IF this is predacated on a Trump win in November and a global collapse this is what I theorize as happening enjoy my personal LARP:
- World economy is SAVAGED to a level never seen before (worse than great depression).
- US will become isolationist both economically and strategically (simply can't afford it and must cut the budget dramatically thereby bringing "home the troops"). Excise taxes on all imported goods could easily be passed at this point and whatever wealth is left will be transitioned back into industrial output. Service industry as a primary economy will probably end fucking finally. Riots, bit of starvation, probably some Communists coming to fore. I could see a form of Economic Fascism coming in. But nothing like FDR's socialist bullshit. I don't see a breakup with Trump at the helm, nor do I see a major war that he'd join in unless we were directly attacked.
- Middle East, esp. Saudi Arabia will suffer a popular uprising against the nobility which will spread across the region (think a counter ISIS) because of a complete crash in oil prices. Without the gibs, the Saudi's have no reason to support the royals. This could theoretically be backed by Iran, who is busy building nukes at this point in the timeline. Syria would be wrapped up overnight as ISIS would no longer be receiving funding, aid, from their (((handlers))). Iraq / Iran / Syria will become the new center of power in the region. Turkey will continue to attempt to buddy buddy to Russia but that's a devils bargain. If Russia has for one instant any question about Turkey undermining Russian interests- I'd expect a rather severe regime change and puppet state.
-Europe cannot afford to maintain the socialist programs that it depends on to placate the citizens, imported sand-niggers, etc. AND offset the power vacuum left by a US military withdrawal. However, I expect the Europeans to make mistakes (like they usually do) and antagonize Russia over the Baltics and Ukraine. Europe is cucked and I think a large part of the herd doesn't have a fighting spirit anymore. If push comes to shove they will try to work their paper tigers, but if they are against Russia- it ain't gonna work. Only thing they could possibly fall back on are the British and French nukes. But if Putin gets the S-500 system in place and working quickly (which they are). That pretty much neutralizes their deterrent capabilities. and they know it
-Russia, already sanctioned and nearly cut off from hard foreign investment, will capitalize on the situation to begin territorial expansion to reclaim Imperial Russian lands (as is Putin's stated aim) as their sphere of influence (if not directly behind their border). This will antagonize the Europeans but they won't be able to do shit about it. There may be a quick European theater of operations, but I would doubt it goes Nuclear. All Putin has to do is threaten to go Nuclear and the EU and Europe will be overwhelmed with anarchy and protests. No bread and no circuses make a grumpy bunch. I strongly doubt that after a major depression Trump would even continue to be a part of NATO since "they aren't paying their fair share."
-China, now economically desperate, begins threatening actions towards the US to instill cohesive patriotism in the people. This could theoretically escalate to a War. If China goes after the US (remember there aren't really any US allies after a complete breakdown), they would hit the Carriers and the Pacific Fleet, may even nuke a few cities especially those with a broad base export manufacturing. Their hope is to set American recovery back 50 years or so and force the US to buy their stuff again. This war would be waged solely for economic reasons (as most are). US does a bit of strategic bombing or lobs a few nukes back and that's that. Either way the balance of Power in the Pacific would probably tilt away from China and the US, probably to a upstart player (Philippines, possibly Japan) due to internal problems (i.e. either reopen Mao's revolution and start purging or they are going to have a Civil War).
But generally a WW3 after a full blown depression wouldn't be like a WW3 if it happened tomorrow, or if Clinton was elected. It would be a series of theater level incursions and border changes with a whole fuckload of people starving because their credit cards and EBT don't work any more. It wouldn't be a short "war" either, and if it pops as bad as I think it is, the winners will probably be the Tahitians.
Everyone loves Tahitians, and Tahiti is just kinda there with plentiful seafood and women.