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On June 14, Americans celebrate the adoption of the first national flag.
Also known as the "Stars and Stripes" or "Old Glory," the first American
flag was approved by the Continental Congress on June 14, 1777.

In 1818, after 5 more states joined the Union, Congress passed legislation
fixing the number of stripes at 13 and requiring that the number of stars
equal the number of states.

http://www.factmonster.com/spot/flagday2.html

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