Why does the flag have 50 stars?

What does this answer mean?

The flag has 50 stars because there is one star for each state. USCIS accepts three versions: because there is one star for each state, because each star represents a state, or because there are 50 states.

The number of stars has changed over time. Federal law says that when a new state joins the Union, a star is added to the flag, and the change takes effect on the next July 4 after the state is admitted. The flag got its 50th star on July 4, 1960, after Hawaii became a state, and it hasn't changed since.

The stripes, by contrast, don't change. The 13 red and white stripes stand for the 13 original colonies, which is the answer to the previous question.

Washington, D.C., and the U.S. territories, such as Puerto Rico and Guam, don't have stars on the flag, because the stars represent states only.

At the interview, say "one star for each state."