Estimates of the total long-term economic costs of the Iraq and Afghanistan wars vary wildly and remain hotly disputed among experts.

Backgrounder: Lingering resentment over NATO’s expansion has strained U.S.-Russia relations.

The Democrats now leading both houses of Congress will exercise strong influence on U.S. trade matters. Experts expect a slowdown in action on trade deals and a tough battle for renewal of the presid…

With U.S. forces mired in Iraq, the cost of war has escalated. But some critics decry the manner in which the war is being funded more than the price tag itself.

Backgrounder: U.S. debate over treatment of detainees hinges on interpretation of the Geneva Conventions.