Charges of foreign power interference in the U.S. presidential election have raised grave national security concerns and touched off multiple federal inquiries that could drag on for months.

As the campaigns to wrest the Islamic State from the territory it held in Iraq and Syria near completion, new conflicts may arise if old political arrangements prevail.

President Donald Trump’s rejection of the Trans-Pacific Partnership (TPP) has intensified debate over U.S. trade policy and its far-reaching effects.

A long-lasting security alliance with the Philippines remains at the heart of U.S. strategy in the Asia-Pacific, a region that includes the disputed South China Sea.

Hydraulic fracturing has unlocked huge reserves of shale gas and oil, transforming the energy outlook in the United States and the world, even as local opposition and falling world prices threaten th…