The challenge is to understand why for a quarter century most urban police leaders and many state and federal policy makers adopted and supported disparity. Causing polities and practices. The answer is not uncomplicated, but it is gradually becoming clear. I believe there powerful forces in the history and culture of American raise relatives interacted as below: The first is a psychology of race relatives characterized by stereotypes of black criminals by preferences for whiteness over blackness and by a resulting lack of empathy among whites for black offenders and their families. The second which shaped the first, is a three century old pattern of economic, political and social dominance of blacks by whites. The third, enables by the first two factors, is the Republican Southern strategy of appealing to racial enmities and anxieties by use of seemingly neutral code words. Thus, it implies that the economic, political and social dominance of blacks by whites, which will cause black criminals, due to race relations characterized difference. Also, it implies the black people will be influenced and be persuaded to do criminal behaviors easily when the America society encountered worse economic development period. For example, black people unemployment number will be raised, due to America worse economy and there are many companies need to dismiss employees to reduce cost, due to worse economy causes worse consumption.