◆ On this day

June 21

3 sourced moments from June 21 in history: New Hampshire's vote put the U.S. Constitution into effect (1788); The first stored-program computer ran its first software (1948); and SpaceShipOne made the first private crewed spaceflight in 2004.

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3 things happened on June 21

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2004 Space · Space Exploration

SpaceShipOne made the first private crewed spaceflight in 2004

Mike Melvill's June 2004 flight was the first private trip to space — but not the X Prize winner, and its successors fly lower.

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1948 Technology · Computing & AI

The first stored-program computer ran its first software

On June 21, 1948, a room-sized machine in Manchester ran a program stored in its own memory, the genetic blueprint of every computer since.

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1788 Society & Economy · Politics & Law

New Hampshire's vote put the U.S. Constitution into effect

On June 21, 1788, New Hampshire became the ninth state to ratify the Constitution, the magic number that turned a proposal into the law of the land.

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