The United States has pursued missile defense technologies for six decades, with mixed results. Changes under the Obama administration, including adjustments to planned defenses in Europe, could port…

Foreign policy is dominating U.S. political discourse for the first time in years. This backgrounder looks at the leading schools of foreign-policy thought on both sides of the political aisle.

President Bush’s five-country trip to Africa is organized to showcase his policy successes on the continent.

Backgrounder: Experts say more should be done to reduce risk on both passenger and freight rail.

China is dealing with growing signs of social unrest and a budding civil society, but the central government’s power grip leaves little room for democracy.