The third president of the United States was Thomas Jefferson, who served from March 4, 1801, to March 4, 1809. Known as one of the American Founding Fathers, he is celebrated for a number of significant contributions to the early development of the nation, most notably for being the principal author of the Declaration of Independence.

Born on April 13, 1743, in Albemarle County, Virginia, Jefferson had a influential background as he was the son of a planter and surveyor. His presidency is noted for major events such as the Louisiana Purchase in 1803, which doubled the size of the United States, and the Lewis and Clark Expedition, which explored the newly acquired territories.

For more comprehensive details on Jefferson's life and presidency, you can refer to his biography on Wikipedia, explore the historical context around him on the Monticello website, or read through various resources provided by the White House Historical Association and Britannica. For a basic list of U.S. presidents, visit the Ohio Secretary of State’s page or Wikipedia's list, which covers all presidents throughout history.

Sources

Thomas Jefferson - WikipediaPresidents of the United States of America - Ohio Secretary of StateThomas Jefferson - Biography, Legacies, & Facts | MonticelloThomas Jefferson - White House Historical AssociationThomas Jefferson, third president of the United StatesList of presidents of the United States - WikipediaThomas Jefferson, the Declaration of Independence ... - Britannica

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