After the war, Pinckney spent some years running his plantations before he returned to politics. Pinckney was governor of South Carolina from 1787 to 1789, most notably presiding over the state convention that ratified the new U.S. Constitution, and then served in the South Carolina House of Representatives in 1791. He was appointed by President George Washington to be the U.S. minister (ambassador) to Great Britain in 1792. While there, he was unable to get British concessions on issues such as impressment or the Northwest frontier forts, so that Washington sent John Jay as a special envoy to negotiate the controversial Jay Treaty. For part of his tenure (1794-1795) as ambassador in Britain, Pinckney also served as Envoy Extraordinary to Spain. He arranged the Treaty of San Lorenzo, also known as Pinckney's Treaty, with Spain in 1795.
Pinckney's diplomatic success with Spain made him popular at home, and on his return the Federalist party made him a candidate in the 1796 presidential election (as the intended running-mate of John Adams). While Adams won the presidential election, complicated scheming to ensure that Adams would have more presidential votes than Pinckney ended up making their opponent Thomas Jefferson vice-president.
Pinckney was elected to the United States House of Representatives from South Carolina to fill the vacancy caused by the resignation of William L. Smith, and he served from November 1797 to March 1801. While in Congress, Pinckney served as one of the managers appointed by the House in 1798 to conduct the impeachment proceedings against William Blount.
Pinckney served as a major general in the United States Army during the War of 1812. His last public role before his death in Charleston was as president general of the Society of the Cincinnati (1825-1828).
Pinckneyville, Georgia was named after Thomas Pinckney after he traveled through the area. That town no longer exists, as its residents left to found the nearby Norcross. Pinckneyville is the name of a Middle School in the Norcross area.
He was married twice, first to Elizabeth Motte and second to the widow of John Middleton, a cousin of Arthur Middleton.
His elder son, Thomas, Jr., was married to Elizabeth Izard, a cousin twice removed of South Carolina Congressman Ralph Izard.
His younger son, the younger Charles Cotesworth Pinckney, married Phoebe Elliott, a daughter of a South Carolina State Representative, William Elliott, and Phoebe Waight.
US Patent Issued to McAfee on Nov. 27 for "Indicating Website Reputations during Website Manipulation of User Information" (New York, Massachusetts Inventors)
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