Ten years after American troops arrived in South Vietnam, communists seized Saigon in an attack that brought the war to a startling conclusion.
A brilliant scientist, Oppenheimer was tasked with the development of the atomic bomb during World War II.
With over a million already dead, heroic American soldiers and nurses served in the closing battles of World War I.
The first officially formed regiment of northern black soldiers who fought in the Civil War.
The U.S. government's response to the Holocaust was slow and fueled by complex social and political factors.
While the U.N. debated strategies for control of atomic energy, the U.S. Navy was preparing for nuclear tests on Bikini Island.
Two days in 1967 revealed a nation divided over a war that continues to haunt us.
American comandante William Morgan went to Cuba to help Fidel Castro return the country to a democracy. Instead, four years later, he was executed.