Conclusion
The crisis of the 1930s made changes in American foreign policy a necessity, and events demonstrated that Franklin Roosevelt made the correct decisions on the major issues to protect American interests and meet the challenges. For FDR, World War II was the second chance for the United States to create a lasting peace, one based on the Grand Alliance, collective security, and the United Nations. Beyond just the defeat of Germany and Japan, it was an opportunity to build a world order that would produce peace and prosperity through a cooperative, multilateral international system. This was Roosevelt's great legacy, to envision a different world than the one that proceeded the war and to begin to establish the values and institutions it would be built on. In doing so, he transformed American foreign policy. Roosevelt was the most important and most successful foreign policymaker in the nation's history.