Culture Shock — Christopher G. Nuttall

Arthur's Seat had never sought a galactic role. A relatively new colony world, a mere three hundred years old, the planet was always isolated from the galactic mainstream. But with the Empire crumbling after the fall of Earth, and other planets taking advantage of the chaos to make their own bids for power, Arthur's Seat suddenly finds itself playing host to tens of thousands of unwanted immigrants, refugees who have been kicked off countless other worlds. But as the planetary government struggles to integrate the newcomers, powerful factions plot to take advantage of the situation and the refugees struggle to carve out a place for themselves, it becomes clear that the entire planet is on the verge of anarchy ... ... And outright civil war may not be far away.