Perhaps the most fruitful way to look at the debate between Morgenthau and Marshall that was carried on--largely below the surface, largely without explicit confrontation--at the end of WWII is that it was an attempt to figure out how to resolve call it two historical problems: the problem of European military culture, and the problem of modern industrial war. Economist Brad DeLong explains.
The Axis of Upheaval: A special report on the coming age of instability.
The Utopian Nightmare : "What is utopianism? It is promising more than you can deliver. It is seeing an easy and sudden answer to long-standing, complex problems. It is trying to solve everything at once through an administrative apparatus headed by “world leaders.” It places too much faith in altruistic cooperation and underestimates self-seeking behavior and conflict. It is expecting great things from schemes designed at the top, but doing nothing to solve the bigger problems at the bottom." Also, be sure to check out the the 16 ideas, values and institutions that may not be with us 35 years from now written by a variety of interesting people and compiled as part of Foreign Policy's 35th anniversary (although not all are free or available without registration).
George Washington University's National Security Archive carries a collection of declassified US documents and articles on Saddam Hussein; Mexico, Cuba and other Latin American countries; Nixon's meeting with Elvis; the CIA and Nazi war criminals; etc.