Here is a reference about a "debate" between Niall Ferguson and Robert Kagan at the American Enterprise Institute. (July 17, 2003. Resolved: The US is and should be an Empire.)
The whole debate transcript is available on the AEI website.
Global Policy Forum (GPF) US Empire page
War in Afghanistan, Iraq
US Empire at work
Invisible Empire in US
Globalization and Inequality
Transnational Corporations:
GPF page, Corporate Profiles, Corporate Crime, Bhopal Principles of Corporate Responsibility
National Security Archive (GWU)
Alien Torts Claims Act – GPF page
Karl Marx, Capital, Vol.1, Chapter Twenty-Five: ”The General Law of Capitalist Accumulation”
Fighting the Octopus – global capitalism