Rikki Tikki Traveller said:
Regarding the Asteroid Impact. Arthur C. Clarke in one of his books uses an impact in Italy as the basis of expansion into space. Only a few hundred thousand died, but it scared the whole human race and the Space Race was ON. If it is good enough for ACC, it could work for 2300AD. You don't need much of an impact to start a chain of events. It could even be small enough that it explodes in the atmosphere, but over a major population area killing a few tens-of-thousands. That would be enough to start it.
Rendezvous with Rama, and the creation of SpaceGuard. The other
Rama books simply didn't happen.
Yeah, there's been some good stuff here in this thread.
I was thinking of an asteroid strike in Kazakhstan, a relatively small one. Chaos ensues, and China moves in to restore order. This sets the stage for the future Central Asian War, as there is now a significant Chinese cultural presence in the 'Stans.
Over in Europe, secondary strikes have caused significant damage. Internal bickering in the EU over how best to handle it leads several nations, including France, the UK, and Ukraine, to go their own way. The situation spirals into chaos sometime around 2025. Most electronic records are lost in a storm of EMP, warhacking, and hardware destruction.
The story picks up again ten years later, with France leading the recovery in Europe and elsewhere. North America is fragmented, with large population loss and displacement due to the loss of transportation and power generation infrastructure. Civil War has broken out in the United States, with Mexico moving to take advantage, "reclaiming" traditionally Hispanic regions. Canada fragments, though with less violence, absorbing some northern states into the new regions (Cascadia on the West Coast, Great Plains, regions, etc). Texas is occupied by Mexico, though the occupation is not going well. Mexico won in purely military terms, but now has to deal with Texan insurgents, employing terrorist, ah, Freedom-Fighter, tactics.
France, using the threat of strikes from the fragments of the Twilight Asteroid coming around again, launches its first unmanned mission in 2044, following it up with a manned mission two years later. In 2061, an unmanned mission departs for the incoming Twilight fragments, with the intent to use a gravity diversion technique to change its course over the next 8 years. This succeeds...