Simplify the following text for a Grade 3 native English-speaking person.
Original: Hawaii ( or in English ; Hawaiian : MokuÄ ina o Hawaii ) is the newest of the 50 U.S. states ( August 21 , 1959 ) , and is the only U.S. state made up entirely of islands .
Simplified: Hawaii became a state on August 21 , 1959 . It is the only state made only of islands .