The women's suffrage movement won the right to vote when the 19th Amendment passed in 1920.
Mathematician and paranoid schizophrenic John Nash's work became a foundation of modern economic theory.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
William "Buffalo Bill" Cody's legendary exploits helped create the myth of the American West that still endures today.
James Michael Curley and his sophisticated political machine dominated Boston for almost half a century.
With data compiled from tens of thousands of sex questionnaires, Alfred Kinsey changed America's views about sex with the Kinsey Reports.
Their intense faith and strict adherence to 300-year-old traditions have by turn captivated and repelled, awed and irritated, inspired and confused America.