On This Day in History, June 21: Ferris wheel opens, Okinawa battle ends, Greenland gains self-rule, WNBA launches, US Constitution takes effect, 5th Harry Potter and other key events

On This Day in History, June 21 saw the opening of the world's first Ferris wheel, the end of Japanese resistance on Okinawa during World War II, Brazil and Pelé secure a third World Cup title, Greenland gain expanded self-government and the launch of the WNBA. The date also includes the birth of Benazir Bhutto, major military battles, constitutional milestones and significant cultural events.