Today in History: June 21, US Constitution becomes law

Today is Saturday, June 21, the 172nd day of 2025. There are 193 days left in the year.

Today in history:

On June 21, 1788, the United States Constitution went into effect as New Hampshire became the required ninth state to ratify it.

Also on this date:

In 1834, Cyrus Hall McCormick received a patent for his mechanical reaper.

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