How are alliances made? In this book, Stephen M. Walt makes a significant contribution to this topic, surveying theories of the origins of international alliances and identifying the most important causes of security cooperation between states. In addition, he proposes a fundamental change in the present conceptions of alliance systems. Contrary to traditional balance-of-power theories, Walt shows that states form alliances not simply to balance power but in order to balance threats. Walt begins by outlining five general hypotheses about the causes of alliances.

Drawing upon...

The Israel Lobby," by John J. Mearsheimer of the University of Chicago and Stephen M. Walt of Harvard's John F. Kennedy School of Government, was one of the most controversial articles in recent memory. Originally published in the London Review of Books in March 2006, it provoked both howls of outrage and cheers of gratitude for challenging what had been a taboo issue in America: the impact of the Israel lobby on U.S. foreign policy.

Now in a work of major importance, Mearsheimer and Walt deepen and expand their argument and confront recent developments in Lebanon and Iran....