After the war, Pinckney, whose marriage in
1773 had made him among the wealthiest men in the colony, defended the
interests of the rich low country planters (against the smaller planters
of the piedmont region and the farmers of the backcountry) and, more generally,
supported conservative efforts to assure political and economic stability
in the state. (For example, like Hamilton, Wilson, and Morris, he was among
those who defended the rights of those who had supported the British (Loyalists)
during the war.) Pinckney realized that efforts to form a stronger national
government would help assure political stability in Carolina.
He was elected a delegate to the Constitutional
Convention. In Philadelphia, he sought to support the interests of the
low country planters and merchants of Carolina. He opposed giving the government
power to tax exports (as Carolina's economy depended on the export of rice
and indigo), opposed a ban on the slave trade (but proposed the compromise
that allowed Congress to ban slave trading in 1808), and opposed popular
election of the House of Representatives (reflecting his commitment to
a hierarchical, elite-led government as in South Carolina). He then returned
to South Carolina and became the leader of the ratification efforts.
In the 1790s, Pinckney served as Washington's
minister to France, and was one of three ministers (appointed by John Adams)
from whom the French demanded bribes in 1797 before beginning negotiations
over outstanding differences (the famed "XYZ Affair").. He would run as
Federalist candidate for vice president in 1800, and even more unsuccessfully
for president on the Federalist ticket in 1804 and 1808. By that time,
South Carolina, and the rest of the nation south of New England, had swung
securely to Jefferson's Republican Party,