Suppose our current world advanced enough to build a space elevator or two (not necessarily the classic kind, maybe it is a space fountain for example), build some space stations around the solar system, maybe even some ground colonies (not of the terraforming kind).
Then countries went to "WW3", except now we span the solar system.
Assuming people ended gunning from total war and diplomacy mostly failed, what would be the aftermath?
Would be everyone nuked? Bombed with asteroids? Would earth be full of asteroid/nuclear/carbon/chemical/biological dust? Would countries resort to Kamikaze ships, crashing space shuttles into each other capitals?
I am looking for this in a harder sci-fi context, no FTL, no aliens, no sound in space, no stealth in space, etc...
EDIT: I want to clarify that I am not asking about social changes, I am asking in the context of the technology, and its effects, again repeating the question itself: would people use nukes for example? what would be the effects of using nukes in a space war? what other weapons countries on earth would come up with when fighting a space war?
Also, I am not assuming humanity survives, but I am not assuming humanity fails to survive either, I just want to know the realistic scenario after all hell broke loose.
EDIT2: Since people keep nagging about what happened.
- Suppose somehow it is 1930s but we already have a couple space stations here and there, some countries have bases on mars, moon and venus (floating ones there, ground ones are too hard to do), and whatnot.
Now WW2 started for the exact same reasons, but Japan has weapons factories in orbit instead of just Tokyo, Germany megalomaniacal weapons plans result in invention of kill sats, "paris gun" can actually shoot into orbit, and US while creating manhattan project obviously already have technology to lob nukes anywhere it wants using missiles instead of airplanes (since it already sent people to other places in the solar system using rockets).
How the solar system (but specially Earth) would look like in 1955?