He was born on April 13, 1743 in Shadwell, Virginia. He was the author of the Declaration of Independence. He was the third president.He was responsible for the Louisiana Purchase. He funded Lewis and Clark's expedition. I'm pretty sure his legacy is being the author of the Declaration of Independence.
One of his dilemmas might have been piracy. Barbary states of north Africa requested money in exchange for the safety of american ships. Tripoli, a place in north Africa, declared war on the United States. Jefferson's solution was to send a small fleet of warships to Tripoli. Tripoli and the United States eventually signed a peace treaty. The United States gave $60,000 ransom for the Philadelphia, and american ship that Tripoli had captured.
I hope this helps :)