Aaron Burr, Jr. (February 6, 1756 – September 14, 1836) was an American politician, businessman, and lawyer who served as the third vice president of the United States from 1801 to 1805, during Thomas Jefferson's first presidential term. A member of the Democratic-Republican Party, he is primarily remembered for the killing of Alexander Hamilton in a duel, as well as his alleged conspiracy to take parts of the United States or the Spanish Empire to form an independent country.
Burr was born to a prominent family in what was then the Province of New Jersey. After studying theology at Princeton University, he began his career as a lawyer before joining the Continental Army as an officer in the American Revolutionary War in 1775. After leaving military service in 1779, Burr practiced law in New York City, where he became a leading politician and helped form the new Jeffersonian Democratic-Republican Party.