Memorial Day
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The gravestones at Arlington National Cemetery are decorated by U.S. flags on Memorial Day
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The Tomb of the Unknowns located in Arlington National Cemetery
Memorial Day is a federal holiday in the United States for remembering the people who died while serving in the country's armed forces.
The preferred name for the holiday gradually changed from "Decoration Day" to "Memorial Day," which was first used in 1882. Memorial Day did not become the more common name until after World War II, and was not declared the official name by Federal law until 1967. On June 28, 1968, Congress passed the Uniform Monday Holiday Act.
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1870 Decoration Day parade in St. Paul, Minnesota
Read more about memorial day (https://en.wikipedia.org/wiki/Memorial_Day)