I find this fascinating and want to read more, but you haven't given me a lot to go on. Any references? What is SES?
In terms of reading more about what's going on in the US in general, the best sources of information are probably just the (often yearly) reports put out by the major governmental agencies: the CDC, the Department of Education, the DoJ, the EPA, etc.
The rise of wealth inequality has been substantially documented, for example http://www.csmonitor.com/USA/USA-Update/2014/1110/Economic-i...