In this very complex, globalized world, despite the power of the United States, we cannot go it alone, ... We do have to work through multilateral institutions. Each of them has their own strengths and weaknesses. The United Nations has both.

The United States has the power to destroy the world, but not the power to save it alone

The United States is the leader of the free world.

The Role of the United States in World Affairs.

If the United States wants to get involved in guerrilla warfare around the world, we ought to ask ourselves very carefully whether that makes sense and what our stakes are in it. We didn't ask those questions in Vietnam.

Four years ago, some said the world had grown calm, and many assumed that the United States was invulnerable to danger. That thought might have been comforting; it was also false. Like other generations of Americans, we soon discovered that history had great and unexpected duties in store for us.