Respuesta :
Jefferson's Republican opponent in the 1800 election was John Adams
Easy!
Answer: Aaron Burr
Thomas Jefferson and Aaron Burr, who were the two Republican candidates, each received seventy-three votes in the electoral college, and the House of Representatives was forced to make the decision of who would be president.
The main member of the Federalist Party that ran against Thomas Jefferson was John Adams, but since he was not part of the Republican Party at the time, he is not the correct answer