There was some discussion in various comments here about corporations and their roll in imperialism on the loss of nation state power.
Though I still need to read and understand more about this, here is a thought.
Nation state power is lost in two directions. First to international institutions like the U.N., IMF, Worldbank, WTO (this may not be of so much relevance for the U.S. yet, but it is important for all other countries) and second to multinational corporations. While there are lot of international laws and frameworks on big and small issues, there is nothing to really regulate capital flow and multinationals.
With the loss of nation state power, the states institutions lose their legitimation. Smaller entities, tribes, religious or racial defined subgroups, gangs etc gain legitimacy and some control.
But unlike nation states, these groups do have even less power to challenge large corporations. If they get into the way of business, they will either get bribed or are fought down.
While the nation states fail, the multinationals or supranationals take over and may even form some kind of states themselves.
This has repeatedly happened throughout history. Though at some point, these corporations do fall apart and the nation states gain again. It will be interesting to find out when and why this happened.
Thoughts, literature on this issue?