When did The new 50 state flag become official?

Answer: July 4, 1960.

History - In March 1959, the U.S. government approved statehood for Hawaii, and in June the Hawaiian people voted by a wide majority to accept admittance into the United States. Two months later, Hawaii officially became the 50th state. The modern United States receives its crowning star when President Dwight D. Eisenhower signs a proclamation admitting Hawaii into the Union as the 50th state on August 21, 1959. The president also issued an order for an American flag featuring 50 stars arranged in staggered rows: five six-star rows and four five-star rows. The new flag became official July 4, 1960.

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