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Hoover Dam
Hoover Dam
, once known as
Boulder Dam
, is a
concrete
arch-gravity dam
in the
Black Canyon
of the
Colorado River
, on the border between the U.S. states of
Nevada
and
Arizona
. It was constructed between 1931 and 1936 during the
Great Depression
and was dedicated on September 30, 1935, by President
Franklin D. Roosevelt
. Its construction was the result of a massive effort involving thousands of workers, and cost over one hundred lives. The
dam
was controversially named after
President
Herbert Hoover
.
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