How many years did it take to build Mount Rushmore?

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The construction of Mt. Rushmore took 14 years.
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In Mountains

What tools were used to build Mount Rushmore?

Jackhammers and chainsaws i thought 90% of the mountain was carved by using dynamite :) A lot of hammers and chipping tools to from the faces for the presidents.
In South Dakota

Why did they build Mount Rushmore in South Dakota?

South Dakota State Historian Doane Robinson had the idea to carvethe likenesses of western heroes in the Black Hills to promotetourism. His idea was to carve the Needles. Doa