I actually toyed with space elevators, but they were just a bridge too far, and they were not the sort of system that worked into the storyline. The space race ATL was still there, just in a different way. The United States was bound and determined to have the upper hand in any future war, from day one (sort of how OTL turned out, but even more pronounced). Space offered that. Someone looked up and thought, "you know, it is a LOT easier to throw something off the top of a building to the ground than to throw something up". From there everything stays internally logical, at least I think it does.
The militarization of space is, in case it wasn't clear, ripping the innards out of the average American. Its bad enough that an actual viable third party has coalesced around it (the Liberal Democrats) in hopes of restoring some sense of proportion. ATL U.S. (and the rest of the A4) is the military-industrial complex run amuck on a grand scale.
The mass drivers are, well , huge. Saipan is six by nineteen miles, and the driver uses a LOT of that space, Guam is even larger. The design I imaged is almost race track shaped, with speed building as the package moves don the track. Each package has a small chemical booster that provides the lasyt bit of energy to reach orbit. I will make no secret that what I know about mass drivers is the result of about three hours of research, if others are actual experts in the field, I can't hope to argue technical details, but the various sources I looked at (during my admittedly limited research) all seemed to agree that this sort of design is technically solid. The Darwin complex is considerable larger than the Marianas facilities, nothing like having a continental landmass to work with when it comes to scale. They are also the single most expensive construction project in human history, with all of the A4 putting major funds into the pie (I did mention the whole tax/innards ripping thing). Still, compared to CBG @ $12 billion a pop, the ROI isn't too bad.
The run out years in the T/L postscript (which, to my utter horror, wound up running THIRTY pages of Word document) represent one possible world. There are almost an infinite number of others, many of the far darker than the one I eventually chose to post (you think the T/L itself was grim...
).
India, BTW, will almost certainly wind up the world's richest nation in ATL 21st Century. While the A4 is spending billions on weapons, India is spending hundreds of millions on commercially viable science. Unless the A4 figures out a way to actually mine the Asteroid Belt (and even I don't dream THAT big), sooner or later they are going to be buying a whole lot of stuff from the Indians
Again, thanks
very much for the comments and the probing questions.
Yes, imagine if someone tried to do that today, even if they had space superiority--it's totally unthinkable. China, India, etc. aren't *that* behind the UN that they will just roll over and take it. (Although India seems to be going for the underseas route, anyways).
It's also...interesting...that this TL hews to what, the First Law of AH (always a better space program)? I mean, this is really a rather more harsh environment for space than IOTL--no Soviet confrontation to drive activity, no Germans to help out (in the US particularly). If anything, I would have expected that space development would be somewhat more backwards by now than IOTL, at least in terms of the heights (in practical terms probably fairly similar, since that's mostly commercial or conventional military applications).
Finally, I'm going to put some more technical objections forwards, this time to mass drivers--while quite practical for Lunar use, they really aren't for use on Earth. The atmosphere's too much of a problem, as is not crushing your payload with g-forces (you need ridiculously long tunnels to get around that, ones that make the Chunnel look like nothing). Chemical rockets are the way forward unless you put in a launch loop, maybe, or figure out nanotubes for space elevators (and *those* have lots of problems).