The first officially formed regiment of northern black soldiers who fought in the Civil War was formed after President Lincoln's Emancipation Proclamation and consisted mostly of free men.
The international race to develop biological weapons during the 20th century.
In the early 1830s, Texas, ruled by Mexico, held 20,000 U.S. settlers and 4,000 Mexican Tejanos, forcing residents to pick sides.
From the Revolutionary War to Operation Desert Storm - newly discovered letters read by celebrity actors tell of courage, longing, and sacrifice.
Robert E. Lee, the leading Confederate general of the American Civil War, remains a source of fascination and, for some, veneration.
A look at five real-life "Rosies," the reality of working in defense plants during World War II and then having to give up those jobs for returning GIs.
The stories of ordinary people in the tumultuous years after the Civil War, when America struggled to rebuild the Union.
General Douglas MacArthur led American troops in World Wars I and II before being fired by President Harry Truman during the Korean War.
During the defining months of the offensive against Germany, American forces faced a moral and strategic dilemma.