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Mount Rushmore was carved mostly with dynamite

About 90 percent of Mount Rushmore was carved using dynamite.

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Nearly 400 men and women worked on it between 1927 and 1941. In 14 years of construction, not one worker died.

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The Marshall Plan sent $13.3 billion to Europe

Over four years starting in 1948, Congress appropriated $13.3 billion for European recovery under the Marshall Plan.

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The first powered flight covered 120 feet

On December 17, 1903, Orville Wright kept the first powered flight aloft for about 120 feet.

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The first cross-country railroad cut months to a week

The transcontinental railroad, finished on May 10, 1869, shortened a journey of several months to about one week.

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