In the 21st century, instead of devoting tremendous national resources—blood and treasure—to defending the entire world against all manner of threats, the United States should behave as a normal great power. Like any great power, the United States must vigorously protect its vital national security interests using many means, including force. Absent a hegemonic threat, such as the Soviet Union, however, the United States should be able to rise above most day-to-day turmoil around the globe.