Targeted killings, especially those conducted by drone strikes, have become a central component of U.S. counterterrorism operations around the globe.

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.

Modern vice presidents can trace much of their political influence to the broad reforms that Jimmy Carter and Walter Mondale made to the second-highest elected office in the late 1970s.

The U.S. Supreme Court is set to determine the fate of millions of undocumented immigrants and could influence how future presidents wield power.