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This Day in American History

June 21

1 historic event on this date

Founding1788

New Hampshire Ratifies the Constitution, Making It Law

New Hampshire became the ninth state to ratify the Constitution, meeting the threshold required under Article VII for the document to take effect. This vote transformed the Constitution from a proposal into the supreme law of the land.

Why It Matters

New Hampshire's ratification was the decisive vote that brought the Constitution into force, completing one of the most remarkable acts of democratic self-creation in human history.

Explore the Principles Behind the History

Every event in American history connects to the founding principles. Discover the ideas that shaped these moments.

View the 28 Founding Principles