During the Great Depression, Americans built the Hoover Dam, overcoming technical challenges to erect one of the greatest engineering works in history.
George Eastman introduced the Kodak and Brownie camera systems and transformed photography into something anybody could do.
The story of the polio crusade pays tribute to a time when Americans banded together to conquer a terrible disease.
The U.S. and the Soviet Union race to build the hydrogen bomb during the Cold War, thus beginning the nuclear arms race.
Major Walter Reed's discovery in 1900 that mosquitoes spread yellow fever halted an outbreak and led to the disease's eventual eradication.
The international race to develop biological weapons during the 20th century.
A biography of the last outlaws of the American Wild West
The New Deal program CCC put three million young men to work in camps across America.
In the early 1830s, Texas, ruled by Mexico, held 20,000 U.S. settlers and 4,000 Mexican Tejanos, forcing residents to pick sides.