He was a man of letters and wrote extensively to the most prominent politicians, lawyers, educators, scientists and philosophers of his day.
He was a polymath, an expert in many different areas, including politics, law, architecture, science and philosophy. He was famous for his great reading ability and wonderful library (which after he died became the origin of the Library of Congress).
Because of this, Thomas Jefferson, the Third President of the United States, can act as a valuable guide to the history of the United States immediately following the Revolution.
Through his many writings, speeches and letters, we can piece together the evidence that helps us understand the foundations of the United States, and understand political, social, religious and economic arguments that are still important in the United States today.