The spatial distribution of different racial and ethnic populations demonstrates that segregation persists in virtually all of America’s housing markets, from large urban areas to rural counties. What exactly are the ill-Line effects of this demographic isolation The most extreme geographic segregation is unique to black Americans and apparently unrelated to economic status and not explained by preferences for the residence, thus strongly suggesting the persistence of racial discrimination. In contrast to poor whites, who typically live dispersed among better-off families, poor blacks, because of residential segregation, are concentrated in poor neighborhoods. As a result, residential segregation contributes to the problems of these areas, including high concentrations of poverty, educational failure, unemployment, extramarital parenthood, crime, and high mortality. In addition, the increasing importance of suburbs as centers for commerce and habitation has drained resources frominner cities and led to a cyclic decline in the political will to address poverty and urban decline, both of which disproportionately affect ethnic minorities.
 

According to the passage, the author would agree with which of the following statements concerning the geographic segregation of black Americans（）
Ⅰ. Black Americans segregation tends to be more intense than among other minorities, such as Hispanics and Asian-Americans.
Ⅱ. The poorest black Americans tend to live dispersed among more affluent blacks.
Ⅲ. Black segregation has taken the form of a vicious circle, perpetuating its own causes.