Mead argues that the democratic nature of American foreign policy has been superior to the isolated genius' behind continentalist policy (ie Bismarck or Kissinger). Mead writes:

The [democratic policy making] system is stable because it is homeostatic; although interest groups perceive themselves in a constant struggle, the net effect of all those struggles is to keep society constantly seeking the point at which dissatisfaction is minimised.

A very succinct description of the liberal republican process.
Cam Riley: South Sea Republic. Freedom, liberty, equity and an Australian Republic.