The United States accepts hundreds of thousands of foreign workers each year in a variety of industries. Persistent U.S. labor shortages and accusations of abuse have reenergized the debate over the scale of these programs.

The United States and other Western countries are reevaluating their foreign investment regulations amid an uptick in Chinese interest in strategic sectors.

Relations between the two countries, long bound by common interests in oil and security, have strained over what some analysts see as a more assertive Saudi foreign policy.

Conceived as the principal defenders of the 1979 revolution, the Islamic Revolutionary Guard Corps has evolved into an institution with vast political, economic, and military power.