Much of Parenti's article is devoted to miitary planning and theory. Any aspect of this would make a legitimate research topic, including but not limited to:
Parenti predicts a rise in xenophobia and racism as a result of militaristic approaches to adaptation. These are both valid topics for a research paper, but so are other forms of discrimiation, including but not limited to:
An extensive collection of encyclopedias and other sources with articles on a huge variety of subjects.
American History Reference Collection (GVRL)
This is actually part of Gale Ebooks, but searching here might help with more focused searches. For example, the Gale Encyclopedia of US Economic History would be useful for many of the topics listed, such as the labor movement, the Depression, etc.
Social Issues Reference Collection (GVRL)
As with the American History Reference Collection, this is a subset of the Gale Ebooks that might help you focus your search.
Links to multiple biographical articles on well-known and not-so-well-known individuals.
Historical Statistics of the United States
Might be useful for more directed questions
Opposing Viewpoints in Context
Presents articles or excerpts from articles on various controversial topics, presenting differing views.
In-depth articles by social scientists that examine the deeper issues and causes of the problems that arose during and after Katrina, not just from the storm itself but from the social structures that interacted with it to produce the disaster.
Natural Disasters from National Geographic Magazine
CDC Natural Disasters (US Centers for Disease Control)