Fast Fact: Thomas Jefferson gained the immense Louisiana Territory for the infant Republic. Biography: In the thick of party conflict in 1800, Thomas Jefferson wrote in a private letter, "I have sworn upon the altar of God eternal hostility against every form of tyranny over the mind of man."

This powerful advocate of liberty was born in 1743 in Albermarle County, Virginia, inheriting from his father, a planter and surveyor, some 5,000 acres of land, and from his mother, a Randolph, high social standing. He studied at the College of William and Mary, then read law. In 1772 he married Martha Wayles Skelton, a widow, and took her to live in his partly constructed mountaintop home, Monticello. Freckled and sandy-haired, rather tall and awkward, Jefferson was eloquent as a correspondent, but he was no public speaker. In the Virginia House of Burgesses and the Continental Congress, he contributed his pen rather than his voice to the patriot cause. As the "silent member" of the Congress, Jefferson, at 33, drafted the Declaration of Independence. In years following he labored to make its words a reality in Virginia. Most notably, he wrote a bill establishing religious freedom, enacted in 1786. Jefferson succeeded Benjamin Franklin as minister to France in 1785. His sympathy for the French Revolution led him into conflict with Alexander Hamilton when Jefferson was Secretary of State in President Washington's Cabinet. He resigned in 1793. Sharp political conflict developed, and two separate parties, the Federalists and the Democratic-Republicans, began to form. Jefferson gradually assumed leadership of the Republicans, who sympathized with the revolutionary cause in France. Attacking Federalist policies, he opposed a strong centralized Government and championed the rights of states. As a reluctant candidate for President in 1796, Jefferson came within three votes of election. Through a flaw in the Constitution, he became Vice President, although an opponent of President Adams. In 1800 the defect caused a more serious problem. Republican electors, attempting to name both a President and a Vice President from their own party, cast a tie vote between Jefferson and Aaron Burr. The House of Representatives settled the tie. Hamilton, disliking both Jefferson and Burr, nevertheless urged Jefferson's election. When Jefferson assumed the Presidency, the crisis in France had passed.