According to Fussell, what causes status anxiety over class in the US, and why is it more widespread than in other societies?

According to Fussell, what causes status anxiety over class in the US, and why is it more widespread than in other societies? 

What are, according to Fussell, the differences between the way the middle classes and elites show off their status symbols? Be prepared to explain this latter question with examples.

What are the characteristics of the "x" class, and how can they be seen as being "outside" the system Fussell describes?