John Langdon and Nicholas Gilman signed the US Constitution on behalf of New Hampshire.
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New Hampshire was the ninth state to ratify the US Constitution, technically establishing the Constitution as the law of the land and bringing the US into existence.
The US Constitution was accepted and signed in September of 1787. It was officially ratified on June 21, 1788 when New Hampshire's legislature accepted it.
If you have the US Constitution in mind, then the last to ratify it was New Hampshire (21st June 1788), its ratificaation made the Constitution legally effective. The ratification of nine states was required for it and New Hampshire was the ninth state. However, from the last four states that eventually signed it was Rhode Island (1790).
Pennsylvania ratified the US Constitution on December 11, 1787, just 4 days after the first state, which was Delaware.
Alexander Hamilton was the New York delegate who signed the US Constitution. Alexander Hamilton was a founding father of the US.