The "Betsy Ross Flag" flying outside City Hall in San Francisco, California, 11 October 2008. Photo by Makaristos (Own work) [Public domain]. Available from Wikimedia Commons.
On 14 June 1777, the Flag Act of 1777 was passed by the Second Continental Congress. Flag Day commemorates the adoption of the American flag.
Bernard J. Cigrand was the first to propose that June 14 be observed as Flag Day. On 30 May 1916, President Woodrow Wilson issued Proclamation 1335, requesting that June 14 be observed as Flag Day. On 3 August 1949, President Harry Truman signed Congressional legislation designating June 14 as Flag Day.
Flag Day (United States)
National Flag Day Foundation
This Day in History: Continental Congress Chooses New Flag
Today in History: June 14 (American Memory, Library of Congress)