Re: How did they create the ethnic division?
According to the film, they picked out people from the population based on appearance, referred to them as "more noble and beautiful", and put them in charge of the other ethnic group. Don't have the exact quote in front of me, sadly.
"Here at Ortillery Command we have at our disposal hundred megawatt laser beams, mach 20 titanium rods and guided thermonuclear bombs. Some people say we think that we're God. We're not God. We just borrowed his 'SMITE' button for our fire control system."