Final answer:
Thomas Jefferson was inaugurated as the third President of the United States on March 4, 1801. His inauguration marked a significant moment in American history as it represented the first peaceful transfer of power between political parties through a popular election.
Step-by-step explanation:
Thomas Jefferson was inaugurated as the third President of the United States on March 4, 1801.Jefferson was the leader of the Democratic-Republican Party and served two terms as President from 1801 to 1809. He was responsible for important events such as the Louisiana Purchase in 1803 and the Embargo Act of 1807.His inauguration marked a significant moment in American history as it represented the first peaceful transfer of power between political parties through a popular election.