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Thomas Jefferson was an American statesman, diplomat, lawyer, architect, philosopher, and Founding Father who served as the third President of the United States from 1801 to 1809. He was one of the primary authors of the Declaration of Independence, which declared the United States' independence from Great Britain. Jefferson was also an influential figure in American politics, serving as the Governor of Virginia, Secretary of State, and Vice President before his presidency. He was known for his advocacy of democracy, individual rights, and the separation of church and state. Jefferson's contributions to American society and politics have had a lasting impact on the country's history and development.