On June 14, 1777, the Continental Congress passed a resolution defining the colors, configuration, and symbolism of the Stars And Stripes, AKA The American Flag. The text of this resolution as reported by the Department of Veterans Affairs official site includes the following:
“…that the flag of the United States shall be of thirteen stripes of alternate red and white, with a union of thirteen stars of white in a blue field, representing the new constellation.”
William T. Kerr gets the credit for founding what we now know as Flag Day, having founded the American Flag Day Association as a youngster attending school in Pennsylvania. But it wasn’t until the 1900s when Flag Day would begin to get its’ due from the federal government.
In 1916, President Woodrow Wilson issued a proclamation that requested an official observance of Flag Day on June 14. His actions were viewed as a recognition of the anniversary of the original creation of the flag in 1777.
President Calvin Coolidge did something similar in 1927, but Flag Day would have to wait as long as 1949 before Congress approved the holiday and it was signed into law by President Harry Truman.
Since then, June 14 is the designated official Flag Day for the United States Flag.