In the future world (based in late 22th century, main place will be Earth) I am creating, I need a giant war so I can make the post-apocalyptic story happen in the first place. The issue is that it is hard to do that in the first place, given how spread humanity has became.
Current human capacities
Humanity has spread to the asteroid belt, space (Lagrange points and geosynchronous for human colonies). Moon, Mars, and Jovian and Saturnian moons. The Moon is a country unto itself, Mars has 10 countries, the asteroid belt is reserved almost exclusively for mining, the Jovian and Saturian moons are base colonies, and space is experimental purposes and hotels. Pretty much everyone has nuclear capacities, and greater (the ultimate weapon that only a few countries have is antimatter nukes, due to UN treaties, so they must be secret). The countries have only slighty reduced, due to increased fragmetation before antimatter could be used as energy. Most military use non-lethal lasers. Assemblers have been made, but you still need to get stuff
The world (Earth) is still tense from a recent cold war, and global warming. The big country (22th century equivalent of US right now) is Brazil. (China/India had some problems, long story). The main languages are Portuguese, Chinese and Untrea (popular international language). The main currency is Bitcoin. Aliens have been discovered, but only bacteria. However, mysterious signals have been found by future SETI.
- I am OK with trans-asteroid belt moons being spared (only like 105,000 anyways)
- I would prefer on Earth, most likely will be most approved. Implausiblity OK, just not "Harry Potter" level (or AI). (i.e., "Misfunctioning translator" over "ALIENS FOUND!!")
- I will add any details asked for in the comments.