I'm not too sure how it'd happen, but there are some clues.
North Korea could send a nuke missile over to the USA or possibly South Korea (which is protected by the US).
Russia could starting invading it's neighbouring countries like Ukraine, Bulgaria and Estonia to try and reclaim the Soviet Union.
The Islamic State's forces could continue to grow and it would invade other countries to add to its 'Caliphate'?
What ways do you guys think WW3 could start?
Most Helpful Girl
ISIS will do something. And the rain of fire and hell will come down and that'll be that.0
Most Helpful Guy
Terrorism in the Middle East as well as the rise of oil prices will cause unrest in that region. Governments may collapse and the supply of oil to the rest of the word will be hampered. This will create the need to get oil and gas elsewhere. For Europe that would be Russia. And as a result, Russia gains a slow therm profit from increased European interest in their resources. But the same goes to the ever expanding China as well who will seek to solidify relations with the bear. Russia will be flexing it's muscle even more with it's neighbors and the worst thing that will happen is that Europe won't be able to do much because they don't want to freeze in the winter.
China's economy is based on expansion and growth without taking note of the resources they consume - just like Imperial Japan before them. And they will soon face the problems of lacking resources and manpower (aging population) and thus will want to expand (jut like IJ). Their immediate target would be Taiwan and the South China Sea - both lie within the US sphere of interests.
Due to the worsening global economic situation, immigration will be an issue for Europe's southern nations that will begin to stagnate economically. A result of this might be a more solidified EU... maybe even an EF by the Western European governments so that they could handle the situation. This displacement of people will create even more unrest and terrorism.
Eventually there will be the spark somewhere like in WW1 that will make everyone jump the war train. China will invade Taiwan, Best Korea will invade South Korea, South and Central America's will be dealing the drug cartels, Russia might try for something as well, India and Pakistan will go nuclear, Iran and Saudi Arabia go to war, ISIS takes over the fertile crescent and then goes for Saudi Arabia since Mecca is there, Israle and ISIS face each other head on, Africa becomes even more fucked, Europe goes nationalist and says "f u" to the immigrants but it's doubtful they will fight with Russia. In fact the two will be at relative peace, maybe a coldwar. The US either collapses or becomes isolationist because the dollar is intertwined with the global oil supply and abroad spending - both of which will stop as everybody will be fucking everybody.
Canada and Australia will be all like "eh? wot happening m8?"0