A profile of the international terrorist network that the United States has singled out as the most serious threat to U.S. security.

Trade accounts for an increasing portion of the U.S. economy, and the Obama administration has embraced a ramped up export strategy. But debate persists over the merits of a vigorous free trade agend…

President Obama vowed in January 2009 to close the prison camp at Guantanamo Bay. Two years later, the White House continues to face challenges to that promise, leaving critics to suggest the facilit…