Hey Minnow! Welcome to the guild. :) 

As far as I know, there are many roleplays that do support situations or even plots that depend on opposing factions and warring. It is quite common here, ranging from urban to even medieval-esque settings. :P Needless to say, it's a widely-accepted plot drive. You'll definitely have no problem with that.

If that didn't answer your question, I'm sorry- I tried. /whiteflag

Nonetheless, I do hope you enjoy your stay here!