The American flag can not be banned.
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1777
Congress adopts the Stars and Stripes
http://www.history.com/this-day-in-history/congress-adopts-the-stars-and-stripes
"the Continental Congress adopts a resolution stating that “the flag of the United States be thirteen alternate stripes red and white” and that “the Union be thirteen stars, white in a blue field, representing a new Constellation.”