Sunday is Flag Day, an annual observance of the Second Continental Congress' official adoption of the stars and stripes in 1777. At the time, they "resolved that the flag of the 13 United States" be represented by 13 alternating red and white stripes and the union by 13 white stars in a blue field, "representing a new constellation.” Now, more than 200 years later and with an updated design, the flag is an American icon.