And that divide is the most unchanging and immune to government fiat - culture.
Government can do a lot to change culture. For instance they have normalized homosexuality legally, which has profound effects on the culture. In this article the government has ended certain laws, and that is effecting the culture.
What government can't change is that race exists, and seems to influence behavior.
As to whether masses of blacks behaving badly is primarily a cultural or racial phenomena is hard to say. There are good arguments for culture, such as individual and groups of blacks that have assimilated to Western norms in various settings. But there are strong counter-arguments to the existence of very similar pathological behaviors in black communities that are widely separated. Black cities in America look more like African cities look more like the black sections of European cities than they do with white cities a hundred miles away.
So I think race is ultimately the more unchanging aspect of this.