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The Pony Express lasted only 18 months

The Pony Express operated for just 18 months, between April 1860 and October 1861.

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Riders carried mail more than 1,800 miles from St. Joseph, Missouri, to Sacramento, California, in 10 days. A transcontinental telegraph line was being built at the same time.

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Almost 200,000 Black soldiers fought for the Union

By the end of the Civil War, almost 200,000 Black soldiers and sailors had fought for the Union and freedom.

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The March on Washington drew 250,000 people

The March on Washington for Jobs and Freedom attracted 250,000 people on August 28, 1963.

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The youngest Nobel laureate was 17

Malala Yousafzai was awarded the Nobel Peace Prize in 2014 at age 17, making her the youngest laureate.

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