Answer :
Final answer:
John Jay's contributions included writing The Federalist Papers, becoming the first chief justice of the U.S. Supreme Court, and negotiating the Jay Treaty with Britain.
Explanation:
John Jay made significant contributions during the Founding Era. He was a key figure in the ratification of the United States Constitution, serving as one of the main authors of The Federalist Papers and later becoming the first chief justice of the U.S. Supreme Court. Additionally, Jay negotiated the controversial Jay Treaty with Britain in 1794.
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