But it all started In May 1776, when Betsy Ross reported she sewed the first American flag. On June 14 of the following year Continental Congress passed the First Flag Resolution on June 14, 1777.
“Resolved, that the flag of the United States be made of thirteen stripes, alternate red and white; that the union be thirteen stars, white in a blue field, representing a new constellation and the states Delaware, Pennsylvania, New Jersey, Georgia, Connecticut, Massachusetts, Maryland, South Carolina, New Hampshire, Virginia, New York, North Carolina, and Rhode Island.
“Today the flag consists of thirteen horizontal stripes. They are seven red alternating with six white,” according to the site. “The stripes represent the original 13 colonies and the stars represent the 50 states of the Union.”
In 1916, after years of unofficially celebrating the holiday, it was made official by President Woodrow Wilson in a presidential proclamation and was finally made “National Flag Day” through an act of Congress by President Harry Truman in 1949.