New York became the 11th state to join the United States of America.
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The US Postal Service was founded.
President Harry Truman signed the National Security Act.
The Summer Olympic Games opening ceremony was held outdoors for the first time ever.
Italian adventurer and author Giacomo Casanova was arrested in Venice for his offensive remarks on religion.
Platform diver Tom Daley won his first Olympic gold medal in men's synchronized diving, 13 years after his first Olympic games.