mythusmage
Prince
WW4 will take place after WW3 has already occurred...
WW3 has already occurred, 1946 to 1990. AKA: The Cold War. I shant be the only one who points it out.

WW4 will take place after WW3 has already occurred...
This would lock China in a war with India, Brazil, and Japan...
There are very, very, VERY many factors that contribute to the outcome of a WW3.
Some include but are not limited to:
- Nukes would most likely be used on the largest urban centers or other strategic locations, possibly wiping out an upward of maybe 99% of the population if the population theoretically wasn't shielded in any way.
- Because of this, many moderately sized (but not big-city) cities will become refuge camps for the surrounding countryside (as the nukes kicked them out of the metro area around the big-cities). This will give rise to the importance of cities that are not so powerful now.
- I'm pretty sure not THAT much technology should be eradicated. I mean, middle school kids even know basic science and math principles that were advanced to the best scholars of the ancient ages.
Basically, there are way more factors in making these decisions than what you'd expect.
3. Our entire knowledge base and communications infrastrure (internet; all things electronic) would be destroyed (EMP) and I sure as heck don't know how to build a trireme.
Our digital knowledge base would be eradicated; most-to-all cities in the western world have one if not several public libraries - and that's not even counting, private libraries, archives for record keeping, etc etc etc. Then there's educational centers; universities often have their own libraries, as well as hordes of informational textbooks - the same can be said about various public and private schools for K-12 levels.
So while you may not know how to build a trireme, considering that any average high-school graduate knows a basic smattering of physics & mathematics, and would have at least a basic base upon which to build, a small community could easily be conceivably building triremes within a few months (depending of course on their priorities).