---
title: "Thomas Jefferson"
chunk: 5/19
source: "https://en.wikipedia.org/wiki/Thomas_Jefferson"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T04:06:33.894887+00:00"
instance: "kb-cron"
---

In 1780, Jefferson received a letter of inquiry from French diplomat François Barbé-Marbois into the geography, history, and government of Virginia, as part of a study of the United States. Jefferson organized his responses in a book, Notes on the State of Virginia (1785). The book explores what constitutes a good society, using Virginia as an exemplar. Jefferson included extensive data about the state's natural resources and economy and wrote at length about slavery and miscegenation; he articulated his belief that blacks and whites could not live together as free people in one society because of justified resentments of the enslaved. He also wrote of his views on the American Indians, equating them to European settlers.
Notes was first published in 1785 in French and appeared in English in 1787. Biographer George Tucker considered the work "surprising in the extent of the information which a single individual had been thus far able to acquire, as to the physical features of the state"; University of Virginia historian Merrill D. Peterson described it as an accomplishment for which all Americans should be grateful.

== Member of Congress ==

Jefferson was appointed a Virginia delegate to the Congress of the Confederation organized following the peace treaty with Great Britain in 1783. He was a member of the committee setting foreign exchange rates and recommended an American currency based on the decimal system that was adopted. He advised the formation of the Committee of the States to fill the power vacuum when Congress was in recess. The committee met when Congress adjourned, but disagreements rendered it dysfunctional.
Jefferson sent a letter (revealed in 2025) to Virginia Governor Benjamin Harrison, dated December 31, 1783, in which he relates the wave of enthusiasm of Europeans for taking up arms against their leaders. Jefferson was sharing the affirmation of his own promotion of the right to bear arms that brought about the American Revolution. The letter also conveys Jefferson's anxiety over the final ratification of the Treaty of Paris formally ending the revolutionary war. Signed initially by the parties in September, the still-outstanding consent of two colonies was required in London (then a two-month journey) by the following March. The deadline was ultimately but barely met, with the required signatures made in mid-January.
In the Congress's 1783–1784 session, Jefferson acted as chairman of committees to establish a viable system of government for the new Republic and to propose a policy for settlement of the western territories. He was the principal author of the Land Ordinance of 1784, whereby Virginia ceded to the national government the vast area that it claimed northwest of the Ohio River. He insisted that this territory should not be used as colonial territory by any of the thirteen states, but that it should be divided into sections that could become states. He plotted borders for nine new states in their initial stages and wrote an ordinance banning slavery in all the nation's territories. Congress made extensive revisions and rejected the ban on slavery. The provisions banning slavery, known as the "Jefferson Proviso", were modified and implemented three years later in the Northwest Ordinance of 1787 and became the law for the entire Northwest Territory.

== Minister to France ==

On May 7, 1784, Jefferson was appointed by the Congress of the Confederation to join Benjamin Franklin and John Adams in Paris as Minister Plenipotentiary for Negotiating Treaties of Amity and Commerce with Great Britain and other countries. With his young daughter Patsy and two servants, he departed in July 1784, arriving in Paris the next month. Jefferson had Patsy educated at Pentemont Abbey. Less than a year later, he was assigned the additional duty of succeeding Franklin as Minister to France. French foreign minister Count de Vergennes commented, "You replace Monsieur Franklin, I hear." Jefferson replied, "I succeed. No man can replace him." During his five years in Paris, Jefferson played a leading role in shaping U.S. foreign policy.
In 1786, he met and fell in love with Maria Cosway, a married 27-year-old Italian-English musician. She returned to Great Britain after six weeks, but she and Jefferson maintained a lifelong correspondence. During the summer of 1786, Jefferson arrived in London to meet with John Adams, who was then serving as the nation's first US Ambassador to Britain. Adams had official access to George III and arranged a meeting between Jefferson and the king. Jefferson later described the king's reception of the men as "ungracious". According to Adams's grandson, George III turned his back on both in a gesture of public insult. Jefferson returned to France in August.