The economic climate and border security concerns have fueled the immigration debate in the U.S. congressional elections. This Backgrounder examines races where immigration is playing a role and the …

Despite concerns over Iran’s nuclear program, the Obama administration has assessed that Tehran is years from a developing a long-range missile capable of delivering a nuclear weapon. But past Irania…

U.S. missile defense in the twenty-first century is focused on emerging threats from North Korea and Iran, but critics say these systems are too costly and largely unproven.

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…