Every year on June 14, the United States celebrates the flag and its historical significance. Though Flag Day is not a federal holiday, people may choose to commemorate the day by flying flags ...

§1. Flag; stripes and stars on. The flag of the United States shall be thirteen horizontal stripes, alternate red and white; and the union of the flag shall be forty-eight stars, white in a blue ...

Each time a new state joins the United States, a new star gets added to the flag. For example, when Hawaii became the 50th state in 1959, the 50th star was added to the flag the following year.