Paper Details: why does harrington argue that"the other America" is invisble? What has happened in america sociiety post world war II to make this population invisble?

One of the most commonly told morality tales is that presidents can come from a background from the most humble of origins and although social classes, more and more being defined by money are long lasting, there existed considerable social mobility in the 19050s and the 1960s. In the 17 years between World War II and 1962, more people moved from being categorized as less affluent and into the economic middle that any time before or after. This mass movement of people to the economic middle class led many to underestimate the extent of poverty in the United States.

Harrington wanted his audience to acknowledge the fact that regardless of the apparent national consensus that the “affluent society” had arrived, there had been continued widespread poverty in an "invisible land" which existed in urban slums as well as rural isolation. In fact, poverty was more than just a mere lack of income but in fact had become a distinct and separate culture. Larger social and economic forces, especially inner-city unemployment, were obvious causes of poverty.