See how Henry Kaiser's love for a young lady spurred him to build the Hoover Dam and the great military war ships.

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On September 30, 1935, U.S. Secretary of the Interior Harold L. Ickes formally dedicates the Hoover Dam during a ceremony attended by President Franklin D. Roosevelt. The dam was built by thousands of workers in one of America's most inhospitable environments.

The awe-inspiring Hoover Dam was built in the 1930s from enough concrete to create a two-lane highway from Los Angeles to Boston. How long did America's largest, man-made reservoir take to complete?

Did you know that the Hoover Dam supplies electricity to more than 20 million people? Get all the facts on this marvel of engineering.

In a This Day in History video, learn that on July 7, 1930, construction began on the Hoover Dam. Twenty-thousand unemployed laborers happily took on the job, but it was a grueling and dangerous task between the scorching desert heat and constant dynamite blasts. When finished, Hoover was the largest dam in the world, standing 726 feet high.

In a September 1940 address to the American Legion, J. Edgar Hoover, the director of the FBI, warns of the growing threat of subversive forces in the United States.