John Lewis Gaddis' acclaimed history of U.S. policy toward the Soviet Union during and immediately after World War II is now available with a new preface by the author. This book moves beyond the focus on economic considerations that was central to the work of New Left historians, examining the many other forces―domestic politics, bureaucratic inertia, quirks of personality, and perceptions of Soviet intentions―that influenced key decision makers in Washington, and in doing so seeks to analyze these determinants of policy in terms of their full diversity and relative significance.