If you were to imagine up a fictional group or association that the UN/US/Britain were to go to war against 150-or-so years from now, what would they be called and what would they be like?

Okay, probably the longest question ever. Allow me to explain.

I’ve recently had the idea and inspiration to write a story about a love between a male and female soldier in a futuristic war. It wouldn’t be too far in the future, perhaps 150 or so years, so I’m coming up with sci-fi orientated machinery, weapons etc. I’ve got a few characters running in my head, but I realised that there couldn’t be a war with no-one to fight against.

The ‘good guys’ belong to a side based on the UN, but i’ll probably change that to something practically the same, yet new, like ‘Confederacy of Territory’ or something just as dumb. I’m having trouble coming up with the opposing team. Please don’t be mean and pick a country or two that you wouldn’t mind bombing the grace out of, I would like something fresh, a collaboration of several types of people. An international-mafia-with-a-whole-army-at-their-disposal kind of thing. Something organised with clear ‘world domination/control’ motives.

Help if you can!

P.S. If any of you want to know where my inspiration came from, there’s a PC game called Battlefield 2142 that I played a lot till my PC broke. Hopefully some of you will know what kind of stuff i’m talking about. My world is terrifyingly different, but that game was what gave me the idea :)