Assertion: american flag's state | /r/CapableOf | enter the union
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Source sentences:
text: American Flag Fact 9: Every time a State entered the Union another star was added to the ensign American Flag Fact 10: The American Flag was officially adopted January 31, 1861 American Flag Facts 11 - 20
text: In 1818, after a few design changes, the United States Congress decided to retain the flag’s original 13 stripes and add new stars to reflect each new state that entered the union.