I can think of another factor that's directly related to the city's crime rate.
Yup, some Americans bought some slaves from Africa over two hundred years ago. Everything bad that has happened since, can be traced to that. There may have been slavery for the previous 4000 years, and slavery in some countries even today (Africa and other Islamic countries), and man may have been treating other men badly since the time Cain killed Abel, but anything bad that has happened can be traced to he fact that slavery was legal in the United States until 1865. It is fair to wallow in self-pity and expect that the United States owes you a free ride. So break the law, and deal all the drugs you want - because you are owed.