The rise of China. Terrorism. Nuclear proliferation. Human rights. Global poverty. Climate Change. What role should military force play in foreign policy? Arguments over how to respond to these issues reflect debates about the appropriate role that the United States should play in the world -- debates that date back to the country's founding. Should the United States aspire to global dominance? Should or can the United States foster the creation of an international society founded upon international law and cooperation? These and other questions will be explored by examining competing views on the most critical foreign policy issues of the 21st century, issues that will redefine the relationship between the United States and the world.