Why does the flag have 50 stars?

Why this is the answer

The flag has fifty stars because the United States has fifty states, and each star represents one of them. The number of stars has grown with the country, from thirteen to fifty: every time a state joined, a star was added, and the count reached fifty in 1959 when Hawaii became the 50th state. Any of the three official answers is accepted. Memory hook: fifty stars, fifty states, one star each.