A U.S. Government film on the effects of botulism toxin on Rhesus monkeys.
The U.S. and the Soviet Union race to build the hydrogen bomb during the Cold War, thus beginning the nuclear arms race.
In 1960, Francis Gary Powers' U-2 spy plane was shot down over the Soviet Union.
At the height of segregation, an unlikely alliance between a black medical genius and a white surgeon led to a pioneering medical breakthrough.
In the early 1830s, Texas, ruled by Mexico, held 20,000 U.S. settlers and 4,000 Mexican Tejanos, forcing residents to pick sides.
During World War II, more than a thousand women signed up to fly with the U.S. military as WASPS.
On June 6, 1944, Allied troops invaded Normandy, fighting to free Europe from Nazi occupation and end World War II.
The first around-the-world air race was sponsored to prove that the airplane had a commercial future.
During the Great Depression, Americans built the Hoover Dam, one of the greatest engineering works in history.