From the Thirty Years' War to the outbreak of World War I (1618-1914)
From World War I through World War II (1914-1945)
The post-Cold War era (1989-present)
East Asia and the Pacific
Terrorism and counterterrorism
The Internet, cyberspace, and cybersecurity
Currency and monetary policy
Sovereignty, self-determination, and balance of power
Internal instability and war within countries