I *AM* a white american. systematic oppression doesn't work: in my experience and in most of our country people of all races are treated equally. In fact, Colleges and employers are MORE likely to hire you if your a minority. Prejudice based on race does still happen, but not as often as people think.
on topic; The empire COULD have forced direct assimilation on every provence besides morrowind and Argonia. However, they didn't. The laws the empire 'forces' upon citizens are basic, just ask any guard.
Trespassing, Pickpocketing, Assault, Jailbreak, murder, theft, and Grand Theft Horse are all reasonable crimes that most governments would outlaw anyway.