While American football can trace its roots back to the mid-1800s, the tradition of the tight, circular huddle began in 1892 to serve a very niche purpose.
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In 1800, when President Adams moved the national capital from Philadelphia to DC, he also approved a $5,000 budget for books. The intention was rather pragmatic: give Congress a quiet place to research.
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In 1921, President Harding presided over a re-burial of an unknown American serviceman who died in WWI. Since then, the Tomb of the Unknown Soldier has hosted an unidentified serviceman from WWII, Korea and Vietnam.
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Historians debate whether Crispus Attucks was a free man or an escaped slave, but they generally agree upon his role in American history on March 5, 1770.
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In 1976, the United States accepted a special gift from Japanese bonsai master Masaru Yamaki: a 400-year-old bonsai tree. Welcomed as a symbol of peace and friendship, the tree became a permanent addition to the National Arboretum.