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.

Flag Day was first observed in 1877, and in May 1916, President Woodrow Wilson declared June 14 Flag Day. Here's what to know about the day.

A flag resolution was adopted 248 years ago, on June 14, 1777, according to the Smithsonian, that said, "Resolved: that the flag of the United States be made of 13 stripes, alternate red and white ...