June 21, US Constitution becomes law

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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