Thomas JeffersoThomas Jefferson is the main author of the Declaration of Independence (1776)

Thomas Jefferson (April 13 [O.S. April 2] 1743 – July 4, 1826) was an American Founding Father, the principal author of the Declaration of Independence (1776), and the third President of the United States (1801–1809). He was a spokesman for democracy, and embraced the principles of republicanism and the rights of the individual with worldwide influence. At the beginning of the American Revolution, he served in the Continental Congress, representing Virginia, and then served as a wartime Governor of Virginia (1779–1781). In May 1785, he became the United States Minister to France and later the first United States Secretary of State (1790–1793) serving under President George Washington. In opposition to Alexander Hamilton's Federalism, Jefferson and his close friend, James Madison, organized the Democratic-Republican Party, and later resigned from Washington's cabinet. Elected Vice President in 1796, Jefferson opposed Adams, and with Madison secretly wrote the Kentucky and Virginia Resolutions, which attempted to nullify the Alien and Sedition Acts.

Elected president in what Jefferson called the Revolution of 1800, he oversaw acquisition of the vast Louisiana Territory from France (1803), and sent out the Lewis and Clark Expedition (1804–1806), and later three others, to explore the new west. Jefferson doubled the size of the United States during his presidency. His second term was beset with troubles at home, such as the failed treason trial of his former Vice President Aaron Burr. When Britain threatened American shipping challenging U.S. neutrality during its war with Napoleon, he tried economic warfare with his embargo laws, which only impeded American foreign trade. In 1803, President Jefferson initiated a process of Indian tribal removal to the Louisiana Territory west of the Mississippi River, having opened lands for eventual American settlers. In 1807 Jefferson drafted and signed into law a bill that banned slave importation into the United States.

A leader in the Enlightenment, Jefferson was a polymath in the arts, sciences, and politics. Considered an important architect in the classical tradition, he designed his home Monticello and other notable buildings. Jefferson was keenly interested in science, invention, architecture, religion, and philosophy; he was an active member and eventual president of the American Philosophical Society. He was conversant in French, Greek, Italian, Latin, and Spanish, and studied other languages and linguistics, interests which led him to found the University of Virginia after his presidency. Although not a notable orator, Jefferson was a skilled writer and corresponded with many influential people in America and Europe throughout his adult life. After Martha Jefferson, his wife of eleven years, died in 1782, Jefferson kept his promise to her that he would never remarry. Their marriage had produced six children, of whom two survived to adulthood.

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